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Messages - Bill Moore

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31
Tubes and Hybrids / Re: Drive channel is too dirty!
« on: November 13, 2009, 07:43:59 PM »
Thanks, I wasn't aware of the difference in diodes. And yes, I intend to try experimenting with some variable resistors, as per teemuk's ideas. If I find a combination I like, I might drill some holes in the rear of the chassis, and install some pots there.
Another thing J M Fahey brought up was my guitar, I don't have a single coil pickup guitar, and maybe the thing will sound great with a Strat! I might take it over to my sister in laws, and have her play through it.
I've got to finish wiring my Twin chassis, and get it off the table before I tear this one down again. But I will report what I've done, and thanks to all for the information.

32
Tubes and Hybrids / Re: Drive channel is too dirty!
« on: November 03, 2009, 12:17:05 PM »
Thanks guys, I really appreciate all of you taking the time to analyze my problem, and offer advice. I am using the amp at low volumes,(actually in a spare bedroom). My old Airline gives me exactly the blues type breakup I like, I was hoping I could achieve a similar sound with the hybrid by tweaking the drive circuit a little. Like Enzo says, it could be a waste of time, but I intend to try your suggestions, and see what it sounds like.
I only got the little amp working for sentimental reasons, I am neither an accomplished guitarist, nor steel guitarist, but I enjoy playing both. I get as much satisfaction building an amplifier as I do playing through it, but learning to modify the amp to achieve a particular sound, I think is an enviable goal.
I will try your suggestions, and post the results, thanks again for your help.

33
Tubes and Hybrids / Re: Drive channel is too dirty!
« on: October 30, 2009, 03:00:14 PM »
Thanks for the reply, I'll get my schematic scanned this weekend, and try to post it Monday.
Thanks again, Bill

34
Tubes and Hybrids / Drive channel is too dirty!
« on: October 30, 2009, 11:28:29 AM »
I ended up with my nephews dead Champ 25, and replaced a few parts, and got it working again. I replaced the speaker with a Mojo heritage clone, and the clean channel is almost Twin clean, really a great sound. The problem is the other channel, even with the gain at zero, it is gritty. Looking at the schematic, there are no less than 7 diodes after the gain control. Has anyone bypassed/removed some of these, or replaced some of them with LED's, or maybe have another fix to get a cleaner sound from this channel? I would like to get it to sound like a single 6V6 amp dimed into a Weber vintage AlNiCo.
I think maybe here at the SS Forum, you guys will have a little more knowledge about the SS preamp, and maybe modified a few. My friend/amp tech, can really make a tube amp sing, but is ambivalent about SS devices. (Although most pedals are not tube!)
Thanks for your help, Bill.

35
Amplifier Discussion / Re: Acoustic 150 to Acoustic 150b?
« on: August 10, 2009, 06:53:41 PM »
Our favorite guitar used one of them with a 6-10 enclosure, really loud. We used to play outdoors a lot, (generator power), only had 1 failure when it fell backwards off a 6 foot stage, made horrible humming sounds. I opened it up and found the internal reverb tank wires were broken, I taped up the RCA plugs, and put it back together, he played it for years after.
I fixed the reverb pan, but Joe didn't use it, last year I put it in a Chinese Fender head.

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