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PostPosted: Tue Mar 07, 2006 10:47 pm 
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I've been thinking for over a year about building Tweed Champ Based Class A WoodCross Amp. My daughter is getting the prototype. :D Meet the partner for the project Str@ I gave her for Christ-mass:

Image
Image
Image

I started with a basic 5F1 Layout. Increased the filtering in the power stage and basic preamp values are pretty standard Champ. I added a Spitfire/Thunderbolt Volume and Tone Control and a Master Volume simular to the Bluesbuster Supreme SE (to keep her mom happy) that acts upon the Power Tube's Control Grid. The Output Transformer is the same as BBSSE, not a puny Champ OT. Added the BBSSE Clean/Mean Switch which happens to work more efficiently in this amp.

She idles about 25 to 50 volts higher than a standard Tweed Champ and that adds mo Clean Headroom. She is wired with my BBSSE Hi/Lo Power Switch so she can not only run a 6V6, but also 6L6/5881 and EL34/6CA7 Power Tubes.

While in the guts, I experimented with a Voicing Control using different Bypass Caps on the First Gain Stage and the Hot Switch from the Version 3 Thunderbolt amps. They work great but I decided to not add them to Mandi's amp because I want it to be simple as can be for her. These will be added as an option to or may be standard in production Thunderchamps though.


CR ><>

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PostPosted: Tue Mar 07, 2006 10:55 pm 
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Interesting, I am considering either a champ or a deluxe for my daughter who has just taken an interest in my telecaster. She finds the guitar is just the right size and weight for her so I guess I can kiss that one goodbye :-)


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PostPosted: Wed Mar 08, 2006 10:34 pm 
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Cool little amp. Wouldn't mind hearing some clips some day.

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PostPosted: Tue Mar 21, 2006 2:20 pm 
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Legin wrote:
Interesting, I am considering either a champ or a deluxe for my daughter who has just taken an interest in my telecaster. She finds the guitar is just the right size and weight for her so I guess I can kiss that one goodbye :-)


:lol: I hear ya Bro! It was the same with my Black Str@.

CR ><>

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PostPosted: Tue Mar 21, 2006 2:25 pm 
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coco wrote:
Cool little amp. Wouldn't mind hearing some clips some day.


Stephen;

I'll see what I can do about a few clips once I get the speaker in for it. It is a mean lil machine with either an old RCA Blackplate 6V6GT or JJ 6V6S. It's absolutely BAD with a JJ EL34L!

CR ><>

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PostPosted: Tue Mar 21, 2006 2:35 pm 
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Sounds like a Champ with a Sptifire front-end. Would that 'sort of' sum it up?

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PostPosted: Thu Mar 23, 2006 3:00 pm 
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coco wrote:
Sounds like a Champ with a Sptifire front-end. Would that 'sort of' sum it up?


Stephen;

Yep, that would sorta sum it up. Mandi's amp has 2 to 3 times the filtering as a standard 5F1 Champ. 47uF>22uF>16uF and the first node resistor is an 8K2 instead of a 10K. This is one of the quietest amps I have ever built. Since the pics were taken, I have removed the 22uF Bypass Cap from the first stage for a bit more clean headroom.

Yep, Basically a Spitfire Front End. 470P Bright Cap instead of 180P. Changed the BIG Orange Drop .01pF on the Tone Control for a much smaller Xicon. It also has a Master Volume that Pat at STF shared with me that he offers with his Champ kits as an option.

I stuffed a board last night to build one of these for myself and this amp will contain all the mods that I have not used on her amp. Voicing Control on the first stage using caps. NFB Switch, Hot Switch to kill the Tone Control.

Thanks!!!
CR ><>

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PostPosted: Fri Mar 24, 2006 8:52 am 
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I would be interesting to hear this little guy cranked.

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PostPosted: Sun Jul 22, 2018 10:02 pm 
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SPAM!!


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