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17th June 2011, 08:56 PM
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#1 |
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diyAudio Member
Join Date: Jan 2008
Location: Bridgeville, CA
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Da Crusher - Champ on steroids
Funny how the discussions turn... I just finished the preliminary tweaking and voicing on this 2 stage volume-only amp, which I started building almost 2 years ago. It does cost more than $100 but it's just what I've needed for a small amp.
The idea was to re-do the basic Champ circuit using parts I had on hand; EF804 input, 807 output, 500V power transformer, and a Doberman OPT. It ended up about 2X the output capability of the Champ and I'm using a 12" speaker so I call it Da Crusher. I switched to a choke input to get about 440V B+ for the 807, which results in a super quiet amp. Just a little EMI buzz with the gain wide open! I started with values based on the Champ and got really lucky on the voicing first time out. Currently using a 12" 50W ceramic speaker in an open baffle (Fender HRD box) and it sounds nicely balanced. The guitar controls and the second input jack at -6db give me a wide range of tone. It's mostly clean with a nice smooth crunch as I dig into my hot pickup. I can't think of anything constructive to do with the voicing now, but plan to try a low wattage alnico 12" in both open and sealed cabs. I also have an Altec 421 15" I want to try for grins. Tons of fun! Michael |
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17th June 2011, 09:11 PM
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#2 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Nice amp!
 I am going to build one using 6N17B and 6P30B tubes. 
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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17th June 2011, 09:14 PM
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#3 |
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diyAudio Member
Join Date: Sep 2008
Location: Near Seattle Wa
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I like it! Are you showing all of the windings on the power transformer? If so, where do the filaments connect? I just dont quite get it .
__________________
"You can keep your insurance baby nothing is guaranteed" -Tom Petty |
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17th June 2011, 10:45 PM
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#4 | |
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diyAudio Member
Join Date: Jan 2008
Location: Bridgeville, CA
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Quote:
There is a 6.3V winding and heater connections which are not shown. I thought that bit was not as important to show. the 6.3V string is simply one side grounded as in the Champ. Thanks, Michael |
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