Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubenit on September 26, 2009, 01:32:11 pm
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Since there seems to be some interest in Champ type amps with reverb, I thought I'd throw this one in the mix.
Preamp is pretty close to the 56T reverb I play but matched to a Champ power section.
I'll try to draw up a layout later and post that also.
I personally prefer the sound of the 6BM8 tube more than an EL84.
With respect, Tubenit
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Very cool as usual Tubenit!
I have been looking closely at your numerous reverb circuits and notice that in some cases the driver and recovery triodes are fed by the same B+ node and in others, a different node. In one case, a VVR controlled node on the driver side and non-VVR on the recovery side.
What determines your choice? What does your experience suggest for a VVR implemented plan?
Thanks as always,
Dave O.
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In one case, a VVR controlled node on the driver side and non-VVR on the recovery side.
Yikes! That shouldn't be the case. All the reverb should be on a non-VVR side.
As far as nodes ........ I usually just pick something between node C and node E. With the higher voltage being for the send. Kinda arbitrary really. I've had successful reverbs I liked with such a huge variety of voltages that I don't put alot of thought into it to be honest.
With respect, Tubenit
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Way cool idea! Please keep 'em coming...
Cheers,
Chip
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Hey tube! very nice Idea man!!!!! however, I found something that may cause future confusion.... :huh:
EDIT: thanks for the catch, I corrected that and reposted in my initial post With respect, Tubenit
With Respect
Best Regards
Rzenc
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I really like this idea. and have added it to my list of amps to build....I made up a parts list....I like 1 watt resistors for less noise (imo)
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Wow, that looks like fun.
What is "PAB" near the tone stack?
(I know I am gonna feel really dumb when I get the answer)
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Looks interesting! I assume the 22pF cap is a high end cut?
I had forgotten there are combo triodes w/power pentode like the 6BM8. Is it at all like the 7199? I imagine it's much cheaper (that wouldn't be difficult).
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P re A mp B oost
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Looks interesting! I assume the 22pF cap is a high end cut?
I had forgotten there are combo triodes w/power pentode like the 6BM8. Is it at all like the 7199? I imagine it's much cheaper (that wouldn't be difficult).
22p is a high end cut.
Not familiar with a 7199? I think the 6BM8 has a Marshallish type tone to it. And I greatly prefer it over the EL84 which sounds way too chimey (& harsh) for me.
Here is a tune done yrs ago with a HoSo56 using 6BM8's. No pedals or effects used. Excuse the mediocre & repetitious playing.
http://www.soundclick.com/player/single_player.cfm?songid=7988948&q=hi&newref=1 (http://www.soundclick.com/player/single_player.cfm?songid=7988948&q=hi&newref=1)
With respect, Tubenit
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5879 + 6BM8 Champ
I like your idea (also without reverb) :thumbsup:
Franco
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How about using two 6BM8s, with one pentode section driving the reverb and the other pentode section as the power tube? IIRC there's a manufacturer's schematic showing this tube used for reverb driver and recovery stages.
Cheers,
Chip
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How about a 6gw8 for the final and driver a 6bm8 for reverb and recovery and a
6av6 5879 for the 1st amp.
-pete