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Old 11th November 2014, 03:16 AM   #1
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Default Tube compliment substitution question. 6gw8 to ?

Hey everyone - thanks for reading.

I've got a Hammond H-AO-44-3 Reverb amp that is missing the 6gw8's.
I'm not inclined to replace them as the tubes are becoming more expensive daily.
However, I'm considering swapping some sockets, drilling new ones, and essentially just using the chassis and transformer, and maybe the original 6CA4/EZ81 rectifier.

Before I do this, however, I'd like someone that is more "fresh" on their knowledge to review my idea and see if it would work. Mainly, I'm just trying to determine workable tube swaps for the 6gw8's.

Original:
6gw8 x 2
6CA4 x 1

Proposed:
5879 x 1 (I love a gibson GA-40)
12ax7 x 1
6AQ5 x 2
6CA4 x 1

From looking through datasheets, it looks like I'll potentially draw a touch more heater current than the original - 2.35 vs 2.32 stock. But that seems negligible as tubes seem to vary anyway. I'm a bit more concerned to be sure that I have enough DC current available. However, from what I can glean, it appears it should work. Anyone see anything I'm missing?

Thanks for your time,
Jeff
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Old 11th November 2014, 03:20 AM   #2
Junm is offline Junm  Philippines
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You can find a cheap russian 6F5P as compliment for 6gw8..they are good....
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Old 11th November 2014, 04:44 AM   #3
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I should clarify that I have the suggested tube compliment in stock.

What should I look at besides filament current draw and plate current draw? it looks like my output power will be nearly identical in p-p.
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Old 11th November 2014, 02:29 PM   #4
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Sure, since you're adding sockets anyway. If B+ is more than 300, consider the tougher 6CZ5 or 6CM6, which are 9 pin equivalents to 6V6. 6V6 could be used if there's room for octal sockets.

Russian 6F3P is equivalent to 6BM8 and would work without adding sockets, but would need rewiring, as the pinout is different.
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Old 11th November 2014, 07:55 PM   #5
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Quote:
Originally Posted by Junm View Post
You can find a cheap russian 6F5P as compliment for 6gw8..they are good....
Actually no, the 6F5P is closer to 6GV8 than 6GW8.
The 6GW8 is higher power and more linear than 6GV8.
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Old 13th November 2014, 03:53 AM   #6
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thanks for the help!
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