Thought I'd share this project here on TAG also.
I have a Tweed BluezMeister amp that is sort of a Dumblish inspired 12 watt cathode biased amp using a 5879 pentode in the OD section.
It uses a 275-0-275 PT. I normally use 6V6's with a 5V4 rectifier tube.
I figured out that if I use a 5Y3GT rectifier, I can get the power tube plate voltages closer to 305v and use a 6BM8 tube for around a 7 watt amp.
I have not installed a SPDT to switch out between a 270 ohm power tube resistor for the 6V6's and maybe a 360 ohm resistor for 6BM8's but plan to.
More information for anyone interested in this idea is here:
http://www.el34world.com/Forum/index.php?topic=16729.0
With respect, 10thtx
6V6 to 6BM8 conversion project
Moderators: pompeiisneaks, Colossal
6V6 to 6BM8 conversion project
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Stevem
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Re: 6V6 to 6BM8 conversion project
Your not gonna hear much of a volume difference, mainly less head room before the output kicks into clipping.
The 6bm8 does give a bit of a different response since it's not a beam pentode like the 6v6.
The 6bm8 does give a bit of a different response since it's not a beam pentode like the 6v6.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: 6V6 to 6BM8 conversion project
That's somewhat correct. 6V6 is barely noticeably louder.Your not gonna hear much of a volume difference, mainly less head room before the output kicks into clipping.
The 6bm8 does give a bit of a different response since it's not a beam pentode like the 6v6.
There is a very significant difference though tone wise. I think the 6BM8 sounds far more Marshall-ish and has more compression.
With respect, 10thtx
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Stevem
- Posts: 5144
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: 6V6 to 6BM8 conversion project
Yes,once again since it's not a beam type tube, it responds and sounds much closer to a el84' or el34.
I have two mid 60s Univox U45B amps that use bm8s in PP with a 12 inch driver and indeed they sound like a little Marshall when pushed with buckers!
I have two mid 60s Univox U45B amps that use bm8s in PP with a 12 inch driver and indeed they sound like a little Marshall when pushed with buckers!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: 6V6 to 6BM8 conversion project
Same idea. 6V6 to EL84
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