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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks much, Van!!! Merry Christmas!! And Merry Christmas to the “Heath” and “Heathkit” members!! <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>73,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Chris<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>W7JPG<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Van Lincoln [mailto:vlincoln@frontiernet.net] <br><b>Sent:</b> Thursday, December 25, 2014 11:34 AM<br><b>To:</b> Chris Kepus<br><b>Cc:</b> heathkit@yahoogroups.com; heath@puck.nether.net<br><b>Subject:</b> RE: [Heath] Grid meter reading on SB-102/ Heathkit Service Bulletin Website<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi Chris: Here you go..........................<br>Merry Christmas !!!!!!!!!!!!!!<br>Van<br>73<br>wd8aam<br><br>This is the Heaethkit (and other manufacturers) Service Bulletin WEBSITE: And MUCH MUCH MORE Heathkit information.<br><a href="http://www.nostalgickitscentral.com/">http://www.nostalgickitscentral.com<br><br></a>NOW,, all the SB-401 Service Bulletins:<br><br><a href="http://www.nostalgickitscentral.com/heath/Service_Bulletins/sb-sb401.pdf">http://www.nostalgickitscentral.com/heath/Service_Bulletins/sb-sb401.pdf</a> <br><br><br><b><span style='font-size:24.0pt'>**********************************************************************************************<br><br></span></b>At 12:42 12/25/2014, you wrote:<br>Hello and Merry Christmas. Van,<br> <br>You certainly delivered a nice Xmas present to the SB-102 owners by sending all the Heath SB-102 service bulletins! J<br> <br>Do you by chance have or know of a source for the SB-401 service bulletins? I suspect where there is some common circuitry in the transmit chain, the SB-102 SB’s might apply.<br> <br>Thanks es 73,<br>Chris<br>W7JPG<br> <br><b><span style='font-size:24.0pt'>**********************************************************************************************<br></span></b><b><span style='font-size:18.0pt'>[No date on fiche]<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-1D<br>LMO Change<br>The [PN 110-32] is no longer available. In order to use [PN 100-40-LMO]<br>it is necessary to add decoupling capacitors [See SB-101 installation<br>procedure].<br>----------------------------------------------------------------------------------------------<br>May 15, 1968<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-2D<br>Filter Choke Replacement<br>PN 46-36 filter choke 4.5H @ 120 MA is replaced by PN 46-32 filter choke<br>4.5 H @ 150 MA. This part should only be changed when the original has<br>failed.<br>----------------------------------------------------------------------------------------------<br>April 10, 1967<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-3D<br>Improving Grid Drive On 20 Meters<br>To improve the 14.0 MHZ grid drive add a 100 ohm 1/2 watt resistor<br>between the two 10 meter coils on the driver grid side.<br>----------------------------------------------------------------------------------------------<br>February 16, 1973<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-1<br>Carrier Null Control Failure<br>Recently an improved mounting method was devised for the [PN 10-147]<br>controls in kit models SB-102, SB-401 and HW-101. Current production<br>utilizes a fiber washer for greater clearance and the case of the control<br>is grounded by a separate wire. We are anxious to know if this will<br>reduce the failure rate. Please make note of any change, good or bad,<br>and keep us posted.<br>----------------------------------------------------------------------------------------------<br>January 29, 1974<br>SB-401 Bulletin No:<br>SSB Tranmitter SB-401-2<br>Relay RL-2 Hang-up<br>After a period of transmission, the relay remains in the transmit<br>[energized] mode, rather than returning to the receive [de-energized]<br>mode.<br>This problem is caused by gassy 6146 output amplifier tubes. When these<br>tubes become hot, there is enough secondary emission from the screen<br>grids to keep RL-2 energized.<br>The solution is to ground lug 7 of RL-1. This grounds the 6146 screen<br>grids in receive, thus preventing the secondary emission current flow<br>from holding RL-2. The SB-401 manual will be revised to reflect this<br>change in new production.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Tranmitter SB-401-3<br>Alignment of SB-301/SB-401 As Transceiver<br>The following method of aligning the SB401 SSB Transmitter for use as a<br>transceiver with the SB-301 SSB recevier may be preferred by those who<br>are not familiar with the units.<br>The SB-301 should be aligned according to the manual. Upon beginning<br>alignment of the SB-401 the heterodyne oscillator crystals, LSB and USB<br>crystals should be removed from the SB-301 and installed in the SB-401.<br>[This step is not necessary if the SBA-401-1 accessory crystal pack is<br>installed]. Do not connect any cables between the two units. Proceed<br>with alignment as given on page 97 of the SB-401 manual.<br>Upon completion of the alignment, remove the crystals and reinstall in<br>the SB-301. Connect all cables and set LMO switch to locked position and<br>funtion switch to transceive on SB-401. The receiver heterodyne<br>oscillators may need to be retouched for maximum drive to the transmitter<br>finals, in some cases going to the top peak on the coils.<br>The receiver BFO coil will also have to be adjusted. The voltage may be<br>measured during adjustment at the 50 MFD capacitor, C127, just to the<br>right of V2 on the carrier generator board in the SB-401. This will<br>eliminate the need for taking the trasmitter out of the cabinet and<br>tipping on its side.<br>The two units are then ready for transceiver operation.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-4<br>Spotting With The SB-301 & SB-401<br>In using the SB-301 SSB receiver and SB-401 SSB transmitter in<br>independent operation with all cables connected, some difficulty has been<br>experienced in spotting in the single sideband mode. This has been in<br>the form of feedback, inability to zero beat a station, etc.<br>The feedback problem can be reduced or eliminated by dressing the red<br>wire between the receiver antenna jack and lug 3 of the antenna relay<br>away from the final amplifier tube sockets. If feedback is still<br>excessive, the red wire may be replaced by coax with the shield connected<br>to the ground lug on the receiver antenna jack.<br>The accepted method of zero-beathing a SSB station is to "talk" yourself<br>in on frequency. Tune in the signal for maximum intelligibility, then<br>with the function switch in spot, "talk" yourself in on frequency until<br>you can also understand your voice. With this method the transmitter is<br>exactly on frequency.<br>You may wish to use a pair of headphones while talking yourself in on<br>frequency.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-5<br>CW Sidetone With Headphones<br>The attached pictorial shows a simple change of interconnecting cables on<br>the SB-401, SB-303 or SB-301 which will allow CW sidetone of the SB-401<br>to be heard on headphones while defeating the speaker.<br>SB401 & SB-301<br>With this combination, make the cable changes shown and then just plug<br>your headphones into the headphone jack. The speaker will automatically<br>be cut off with headphones plugged in.<br>SB-401 & SB-303<br>With this combination, make the cable changes as shown and then plug your<br>headphones into the headphone jack. The difference here is that you must<br>pull the speaker disable switch on the front panel of the SB-303 to mute<br>the sidetone fromthe speaker.<br>((Sorry, but even with magnifying glass I cannot read the connections<br>shown on the backs of the examples. Also, the rear of the 401 & 301<br>isn't like the ones I have sitting here? [But then, my manuals are dated<br>1966!] )<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-6<br>SB-401 RF Voltage Service Guide<br>On the attached schematic we have indicated RF voltages as measured in an<br>SB-401 in the 80-meter CW key down condition. RF voltages are provided<br>at the grid and plate of each stage so that it can be determined if the<br>problem is in the grid or plate circuit of the stage.<br>An 11 megohm input VTVM and Heath 309C RF probe was used to make the<br>measurements.<br>The voltages will vary from transmitter to transmitter and should be<br>expected. Crystal oscillator voltages will vary considerable.<br>This procedure traces the RF signal voltage from stage to stage. It is<br>an easy method to isolate a problem stage so that steps can be taken to<br>correct the trouble.<br>We suggest starting at the carrier generator and working trough to the<br>final, as each stage is dependent on the previous stage.<br>Trace the RF up to the point it is lost, then back up one stage. Should<br>one or two bands be operating properly and the rest have difficulty, make<br>reference RF voltage measurements on one of the operating bands and make<br>comparison measurements on the inopeative bands. In this way the stage<br>causing difficulty is quickly isolated.<br>Once the stage is isolated steps can be taken to correct the problem.<br>Check for wiring errors, intermittent solder connections, loose hardware<br>and bent switch contacts.<br>((NOTE: Voltages shown on the schematic were:<br>1.5V [Pin 2 of V9]<br>36V [Pin 6 of V9]<br>36V [Pin 5 of V10] ))<br>Voltages taken on 80 M. 260 mils plate current<br>125 watts output on HM-102 Level control at 10:30<br>position<br>.5 mils grid current Measurements taken in<br>tune<br>position with exception of one at<br>V5 (USB)<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-7<br>SB-400 / SB-401 CW VOX Troubleshooting Guide<br>It is assumed that the basic steps such as making DC voltage<br>measurements, checking the tubes and reviewing the soldering, have been<br>completed.<br>The following information was compiled using SB-400 and SB-401<br>transmitters in the 80M CW key down condition.<br>The AC signal voltages have been measured with a VTVM throughout the CW<br>Vox circuit and are as follows. Note: The voltages may vary some from<br>transmitter to transmitter.<br>SB-400 SB-401<br>Pin 11 of V13 .5VAC .5VAC<br>Pin 9 of V13 25VAC 20VAC<br>Pin 9 of V12 1.6VAC 1.2VAC<br>Pin 10 of V12 90VAC 70VAC<br>Pin 11 of V12 1.7VAC 1.5VAC<br>Pin 2 of V12 45VAC 45VAC<br>Pin 7 of V12 18VDC 21VDC<br>By tracing the AC signal from stage to stage the point of trouble can be<br>isolated and steps taken to correct it.<br>Check for bias removal at pin 9 of V12 when the key is closed. If the<br>bias voltage is not removed check the wiring of FIR LUGS 11 ans 12. Also<br>check for continuity from the key jack to R127 through FIR.<br>A change in VOX delay after operating for a period of time can be caused<br>by leakage in diode [SB-400 D-2] [SB-401 D105]. The other possibility<br>is a change in value of capacitor [SB-400 C123] [SB-401 C141]. Either<br>component could experience a change in operating characteristics due to<br>heat. In such a case mount the two parts on the bottom of the circuit<br>board to correct this condition.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-8<br>Alternate Tune-up Procedure For SB-401<br>Before proceeding, review and understand the description for each of the<br>controls indicated in figure 1-2, fold-out from page 86.<br>Preset controls as follows:<br>Function Switch TRCV or TRAN<br>Mode Switch CW<br>Band Switch Desired band<br>Meter Switch Rel PWR<br>Level Control Full CCW<br>Freq Control Locked or Unlocked<br>Final Load 50 Ohm Mark<br>Final Tune Desired Band<br>Driver Tune First Mark from full CCW<br>Main Tuning To desired frequency<br>NOTE:<br>If the SB-401 is used with a receiver other than the Heathkits SB-300 or<br>SB-301 the function switch should be at [TRANS] and the freq control at<br>unlocked.<br>NOTE:<br>The key should be closed during and opened after each step, unless<br>otherwise stated.<br>***DO NOT HOLD THE TRANSMITTER IN A KEY DOWN CONDITION IN EXCESS OF<br>30<br>SECONDS OR DAMAGE COULD RESULT TO THE FINAL AMPLIFIER TUBES.***<br>1. Plug the key in the keyjack.<br>2. Advance the level control to 12:00 o'clock.<br>3. Close the key and peak the meter for maximum REL PWR with the final<br>tune control.<br>4. Peak the driver tune control for maximum REL PWR indication.<br>5. Peak the final load control for maximum REL PWR indication.<br>6. Repeat steps 3, 4, 5<br>7. Turn the meter swtich to Grid; DO NOT CLOSE KEY.<br>8. Close the key and check the grid current. If in excess of half<br>scale, turn the level control counter clockwise to bring the meter<br>reading to half scale or less. If less than half scale but above zero do<br>not adjust.<br>9. Tune the meter switch to plate; DO NOT CLOSE KEY.<br>10. Close the key and check the plate current, It should be between 200<br>and 240 MA.<br>11. Repeat steps 3, 4 and 5 with meter in the REL PWR position.<br>12. The transmitter is now fully loaded and ready for CW operation.<br>13. For SSB operation set the mode switch to the desired SSB mode.<br>14. During SSB operation turn the meter switch to the ALC positon.<br>Adjust the mike level control for proper ALC indication as indicated on<br>page 108 of the manual.<br>15. Antennas which resonate to the transmitting frequency, presenting a<br>low SWR and an impedance of 50 ohms, should be used.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-9<br>SB-401 Instability and Corrective Information<br>***We suggest you check for each of the following possible causes***<br>1. Intermittent, rosin or cold solder joints.<br>2. Loose hardware at tube sockets, terminal strip, circuit boards and<br>shields.<br>3. Poor lead dress at V5, V8, V9, V10 and V11. The component leads must<br>be as short as possible, while dressing the part down against the<br>chassis.<br>4. Check RFC 4 and RFC 6 to be sure they are not interchanged.<br>5. Coil leads to the band switch should be as short as possible.<br>6. Check all edges of the final enclosure for proper grounding to the<br>main chassis.<br>7. Check C26 [Final tune capacitor] to be sure it is isolated from its<br>turning shaft. This is to prevent RF from traveling on the shaft to<br>the front panel.<br>8. Check for good contact of the ground clip to the coil box.<br>9. Be sure the shield plates are properly installed in the coil box.<br>10. A 100 Ohm 1/2 W resistor should be installed between lugs 1 of coils<br>CM and CN. This replaces a short length of buss wire between the<br>two coils.<br>11. The leads for capacitor TA should be down on the chassis not run<br>through the air.<br>12. If the SB-401 is being used with the SB-300 or SB-301 in the<br>transceive mode the accessory crystal pack should not be<br>installed in the SB-401.<br>13. Change the driver and final tubes then reneutralize per manual<br>instructions.<br>14. Improper adjustment ofthe Het OSC coils could cause improper mixing<br>action, resulting in the final operating at a different frequency,<br>appearing as instability.<br>15. Check for a good ground between the front panel and chassis.<br>16. Check the SWR of the antenna system at frequency of operation.<br>17. Check the COAX for leakage.<br>18. Is the trasmitter properly grounded?<br>19. Realign using a properly terminated 50 Ohm not-reactive dummy load.<br>[[[NOTE: THIS DOES NOT INCLUDE A LIGHT BULB]]].<br>20. Be sure all shield and tube shields are installed.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-10<br>SB-400 & SB-401 Hum Troubleshooting Guide<br>1. Disconnect one lead of the low voltage filter choke and measure its<br>resistance. Its normal resistance is 120-140 ohms. If the<br>resistance is below 100 ohms the choke is shorted and should be<br>replaced.<br>2. Check the following capacitors for leakage:<br>SB-400 SB-401<br>C180 C183 C78 C403<br>C181 C184 C79 C404<br>C179 C147 C81 C402<br>C182A C185 C77A C106<br>C182B C77B<br>3. Check terminal strip and terminal board grounds.<br>4. Retighten hardware at tube sockets, terminal strips, circuit boards<br>and shields.<br>5. Check the tubes for heater to cathode leakage.<br>6. Check the grounds for the shield lead of each length of shield cable.<br>7. Recheck all solder connections. Be sure that the [C79 SB-401], [C181<br>SB-400] mounting lug is securely soldered to the metallic mounting<br>wafer.<br>----------------------------------------------------------------------------------------------<br>May 23, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-11<br>SB-400 & SB-401 Driver Stage Troubleshooting Guide<br>It is assumed that the basic steps such as making DC voltage<br>measurements, checking tubes and reviewing soldering have been completed.<br>Normal drive to the grid of the 6CL6 is 1.5-2.5V RF on all bands. In<br>some cases it will be higher.<br>1. Check to see if the blocking bias is being removed from pin 2 of the<br>tube during the key down or tune conditions. The bias is about -15VDC in<br>a key up condition; in the key down condition it is about -.5VDC.<br>2. Check the cathode resistor to be sure it is of the correct value<br>[SB-401 -- 150 ohms], [SB-400 -- 100 ohms] and correctly installed.<br>3. Check the wiring of [SB-400 - C90, A, B, C, D], [SB-401 - C4, A, B,<br>C, D], to bandswitch decks BS3R and BS4R. If two of the sections are<br>interchanged, peaking of the coils will be incorrect and very low drive<br>will be present.<br>4. Incorrect adjustment of the 8MHZ trap can cause suck out on one or<br>more bands. To adjust the trap correctly complete the outlined steps in<br>the manual.<br>5. Check the screen and plate voltages for the 6CL6 in the key down<br>position. If 50V or better low, check the following components: SB-400;<br>R-93, R-94, RFC-92, C-164, C-97 AND C-99. SB-401; R-4, R-5, RFC-4, C-8,<br>C-7 AND C-58.<br>6. The capacitors mounted on the driver coils should have as short leads<br>as practical. All leads from the coils to the andswitch should not be<br>any longer than necessary.<br>7. Bypass capacitors shold have short leads and be placed as close as<br>practical to the chassis.<br>8. Check the ground of the shield for the shielded cable used in the<br>plate circuit of the 6CL6.<br>9. Check the value of [SB-40 R-94] [SB-401 R-5]. The value should be<br>6.8K and 1W. This resistor determines the drive to the final amplifier<br>stage. This is accomplished due to the RF voltage drop across the<br>resistor.<br>10. Retighten hardware at the tube sockets, terminal strips and shields.<br>----------------------------------------------------------------------------------------------<br>July 24, 1974<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-12<br>Incorrect Resistance Reading at Terminal Strip AC<br>Refer to manual # 595-947-07, Page 88. The resistance readings at lugs 2<br>and 4 of terminal strip AC will be zero, since the addition of the ground<br>wire to lug 7 of the main relay RL-1.<br>----------------------------------------------------------------------------------------------<br>July 24, 1978<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-13<br>LMO Drift, Intermittent Frequency Shift<br>Check for a dirty or corroded phono connector on the rear of the LMO.<br>CLean if necessary.<br>----------------------------------------------------------------------------------------------<br>August 7, 1978<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-14<br>Loading Capacitor Turns as Plate Capacitor is Rotated<br>This problem can be caused by:<br>- Insufficient friction in the loading capacitor or;<br>- Excessive friction between the plate and load tuning shafts.<br>If the problem persists after freeing and lubricating the shafts, install<br>a rubber grommet [PN 73-3] on the loading capacitor shaft between the<br>pulley and the RF cage. Apply slight pressure to the grommet as the<br>pulley set-screw is tightened. This will add enough friction to keep the<br>loading capacitor still while tuning the plate control. Use only as<br>needed.<br>----------------------------------------------------------------------------------------------<br>January 21, 1980<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-15<br>Driver Plate Resistor Overheats<br>+ + + + Information not yet available + + + +<br>----------------------------------------------------------------------------------------------<br>March 7, 1980<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-16<br>Will Not Work With HDP-1220 BW Clipper<br>+ + + + Information not yet available + + + +<br>----------------------------------------------------------------------------------------------<br>April 10, 1980<br>SB-401 Bulletin No:<br>SSB Transmitter SB-401-14<br>Germanium Diode Change<br>+ + + + Information not yet available + + + +<br>----------------------------------------------------------------------------------------------<br>That is all I presently have for the SB-401 [1966-89]. Enjoy!<br>73 de Joe W7LPF/4 [NNN0KUU]<br>QWCA - SOWP - NCVA - FISTS - RCC<br>Gordonsville, Va 22942 [Orange Co]<br><br></span></b><b><span style='font-size:24.0pt'>=========================================================================<br><br><br></span></b><o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'> <br> <o:p></o:p></p><pre> <o:p></o:p></pre><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><pre> <o:p></o:p></pre></div></body></html>