WR
Joined: Feb 27, 2006
Posts: 3832
netherlands
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Posted on Jul 03 2007 06:16 AM
here's one for the pro and/or semi pro amp builders. I 'm considering building a small amp to take to practice and stuff, and the idea is to make a full 50-ish watt 2x6L6 amp, but with just one channel and no frills, and just volume - bass - treble controls. think bassman/bandmaster with just the normal channel.
Now the question is, Im pretty sure I can stuff all the tubes and iron in/on a princeton chassis, which sizewise would be ideal for this project.... but... will I get serious hum and/or heat problems having everything crammed together?
help appreciated!
WR
— Rules to live by #314:
"When in Italy, if the menu says something's grilled, don't assume it is."
https://www.facebook.com/The-Malbehavers-286429584796173/
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eddiekatcher
Joined: Mar 14, 2006
Posts: 2766
Atlanta, GA
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Posted on Jul 03 2007 07:29 AM
Na, somebody's already done that......it's called a Mesa Boogie Mk 1.......ed
— Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps?
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WR
Joined: Feb 27, 2006
Posts: 3832
netherlands
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Posted on Jul 03 2007 07:52 AM
good point. I knew they were based on Fenders but actually voiced for higher gain. that would give more problems though I guess. found this pic of a boogie.
more insights still apreciated.
image
— Rules to live by #314:
"When in Italy, if the menu says something's grilled, don't assume it is."
https://www.facebook.com/The-Malbehavers-286429584796173/
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PhatTele
Joined: Jun 05, 2006
Posts: 445
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Posted on Jul 03 2007 07:53 AM
A Princeton Reverb chassis (or non-reverb Princeton) works great. You can get beefed up transformers that fit the same hole cutouts (no drilling) from Allen Amplification:
http://www.allenamps.com/parts.php#transformers
I've built several 6L6 Princeton Reverbs using these transformers along with 12" or 15" Weber Californias or 15" JBLs. They make great clean 25 watt amps. My friends and I use them all the time for gigs (surf, R&B, blues, country).
If you can get past the sacrilege, late 70s SF push/pull Princeton Reverbs are great for this type of mod because you can still get them relatively cheap. Just get rid of the push/pull circuit and put in the beefier iron. Leave the rest of the circuit alone. Then, stick the chassis in a new 1x12 or 1x15 cabinet. Voila...now you've got a 25 watt tone monster. If you don't like modding old amps, Allen Amps, MojoTone, and Weber VST all have Princeton Reverb-style kits you can buy.
If you want more power, you can cram in a Super/Bassman/Bandmaster sized power transformer into a Princeton chassis. However, you'll need to cut a larger hole for the transformer, move the bias circuit to the board, and you'll have to move the cap can to a "doghouse" style cap arrangment (like the AB763 style amps). All that and you'll have less room for the length of your circuit board. You'll probably have to build your board from scratch to try and economize on space. It can be done, but not without a lot of distruction to the chassis. In fact, I built a single channel AB763 (w/reverb but no tremolo) out of an old previously hacked up no guilt BF non-reverb Princeton, a Bandmaster power transformer and a multitap Bandmaster/Pro output transformer from Allen Amps. It's a beast of an amp.
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