[Hallicrafters] 6000 tube

[Roy Morgan]

At 01:58 PM 1/13/2006, howard holden wrote:

>Try a 6AV5 or 12AV5 and change the filament supply. There is no 25AV5 as 
>far as I know. The ----AV5s are the same base as the 6000. Not many tubes 
>on that base. Sounds like this is for a T-368.


Howie,

I did a bit more searching. Here are at least some tubes with the same 
base. There seems to be a 25AV5, by the way.  Plate dissipation may be the 
problem:

Tube      Plate dissipation      AES price

6000      25 watts               $31.00
6FW5    18 watts                   4.40 out of stock
6AV5     11 watts                   6.20
25AV5   11 watts                   (not found)
6AU5     10 watts                   5.50
6BD5     10 watts                   3.20
All the above have the same base: 6CK


The tubes having the same base, according to:
NJ7P Tube Database Search
http://www.nj7p.org/Tube1.php?base=6CK

Are:
  6AU5GT  6AV5GA  6AV5GT  6BD5GT  6FW5  12AU5GT
12AV5GA 17AV5GA 25AV5GA 6000

There may well be compactrons with high enough plate dissipation to do the 
job. One suggested is the 6JS6, the 6JS6C has a plate dissipation of 30 
watts, has a 12-pin base and plate cap, and was apparently made in 12, 21, 
23 and 31 volt filament versions.

Tube      Plate dissipation      AES price
6JSB6      30 watts               38.70
6JSS6C    30 watts               50.90
23JS6       30 watts               19.00

Personally, if I wanted to substitute for unavailable type 6000's in a 
transmitter, I might well put in an 807 or 1625.  The main reasons are that 
either would do the job, and I have some at hand.

Naturally,  filament voltage and pin changes would let you run any of the 
6550 type tubes including easy to get KT-88 and KT-90 types.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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