3-400Z

[Larry Gauthier]

Keith,

I think Martin was asking if a 3-500 can replace a 3-400 (not the other way
around). And the answer is still a qualified "yes". The tubes are
pin-for-pin equivalents, but the 3-500 has a larger glass envelope. There
may be cabinets/chassis in which the 3-400's will fit but the 3-500's will
not.

-larry
K8UT
----- Original Message -----
From: "k4kgw" <k4kgw at MEDIAONE.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, September 01, 2001 2:12 PM
Subject: Re: 3-400Z


> 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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