6DS4 tubes

[Bob & Bettina Groh]

Dave,

You either have a lot of bad tubes with open filaments or (more likely)
your tube tester is not working.  I checked my 1971 ARRL Handbook and did
find a listing for the 6DS4 - 6.3V high-mu triode.  You can check the
filament connection on the tube with an ohm meter (expect somewhere around
6 ohms or so?? ).  If ok, check the filament  sockets on the tube checker -
should have 6.3VAC there.  If both check out, back to square one.  But I'll
bet one or the other is not right (maybe the switches on the tube tester
are not set right??).

Basically you have to have a filament glowing for the tube to have a prayer
of working.  And that means it should definately be warm or even hot within
30 seconds or so of turning it on.

Good luck.

Bob Groh, WA2CKY

----------
> From: Leisman <wb8baf at voyager.net>
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: 6DS4 tubes
> Date: Saturday, July 10, 1999 7:24 PM
>
> I have an SB-110a that I'm trying to restore, and this has been a
> trail.  The wiring has been a mess, and several tubes needed
> replacement.  My questions surrounds the 6DS4.  When I try to test one
> of these in the tube tester (my tester actually has a socket for the
> tube) I can get no emission reading, Grid leakage tests ok, and there
> are apparently no shorts, but the tubes does not feel even "warm" from
> the filaments either.  I have tested 6 of these tubes and same result
> each time.  I even tested a 6SK4 with the same result.
>
> Through the SB-110a I can hear a small signal from a generator, and the
> LMO is working, but I cannot seem to get much more than the smallest
> signal into the speaker.  The 6DS4 tubes are V1 and V2 respectively in
> the front end of the receiver.
>
> Anyone have any suggestions, or any experience with these tubes?
>
> Your assistance is appreciated.
>
> Dave, W8QW
>
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