3-400Z

[k4kgw]

Martin, the answer is a qualified "yes."  What is meant will be evident from the comparative specifications
for the two tubes, given below:

3-500Z                                                                    3-400Z

Plate Dissipation:  500 watts                                  400 watts
Max Plate Voltage  4 KV                                       3 KV
Max Plate Current  400 ma.                                     370 ma.
Max Frequency, full output:  160- mHz                    110 mHz
Amplification Factor:  160                                        200
Input Capacitance:  7.4 Pf.                                        7.4 Pf.
Plate-to-Grid Capacitance:  4.1 Pf.                            4.1 Pf.
Output capacitance:  0.07 Pf                                      0.07 Pf
Fil voltage & current:  5V @ 14.5A                            5V @ 14.5A

TYPICAL CLASS B GROUNDED GRID OPERATING PARAMETERS;

Plate voltage:  3KV                                                     3Kv
Plate current:  370 ma.                                                 100/333 (voice)
Grid voltage:  0                                                             0
Grid current:  115 ma.                                                   120 ma.
Driving power (single tube):  30 watts                             32 watts
Power Output:  750 watts                                               655

I know several hams who have replaced their 3-500Zs in rigs like the SB-200 and similar rigs where the plate
voltage does not run over 3KV and have had no problems.  The 3-400Z is a good bit cheaper than the 3-500Z,
also.  Furthermore, the difference between 750 watts out per tube and 655 watts out can't be detected on the
other end.

Hope this is of help.

Keith
  .

Martin Tippin wrote:

> Can anyone tell me the out put of the 3-400Z verses the 3-500Z and can a 500 replace the 400? thanks guy's
> Martin L Tippin  W0AKG
> 140  Monarch Lane
> Branson,  MO  65616
>
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