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previous: Rebel420 Re: Self-inverting EL84's, etc. -- 3/10/2000 8:05 PM

Sound Clip

3/12/2000 4:50 PM
MBSetzer	Sound Clip Hi Rebel, Well, there was at least one error on the drawing. The first preamp section gets its high voltage from the screen supply, not the plate supply that I have drawn. Still not like a regular guitar amp. I did one take of an MP3 and posted it at: http://members.aol.com/setzeramp Actually only the first half of the file uploaded before I lost contact with aol, the unreliable. Just as well it was lame picking, plus I can't yet edit out the first part where it's blank while I walk from my desk to the lab, shut the door, pick up the guitar and start. This was the amp stock, I didn't have a CB mic to fit, used a screw-on probe connector from a surplus probe from an old simpson VTVM. With a phone jack on the other end, plugged the guitar straight into the mic input. Both volumes are interactive so I keep the MUSIC knob maxed always. Start with the MIC knob halfway up for a few clean notes, then fading sustain as I dime the MIC control & torture my speakers Ears too. It is a little unstable at full volume but I thought it had potential, so I started tinkering with the circuit, I'll let you know when it's an actual guitar amp. I decided to leave the tubes as is and let the 6BQ5's self-invert, changing relatively few items and expecting it to be even better as an office PA than originally. Until then I did get the stock voltages and as soon as I get more time I'll update the drawing and correct it as well. Good Luck, Mike

3/12/2000 4:50 PM

MBSetzer

Sound Clip

Hi Rebel,

Well, there was at least one error on the drawing. The first preamp section gets its high voltage from the screen supply, not the plate supply that I have drawn. Still not like a regular guitar amp.

I did one take of an MP3 and posted it at:

http://members.aol.com/setzeramp

Actually only the first half of the file uploaded before I lost contact with aol, the unreliable. Just as well it was lame picking, plus I can't yet edit out the first part where it's blank while I walk from my desk to the lab, shut the door, pick up the guitar and start.

This was the amp stock, I didn't have a CB mic to fit, used a screw-on probe connector from a surplus probe from an old simpson VTVM. With a phone jack on the other end, plugged the guitar straight into the mic input. Both volumes are interactive so I keep the MUSIC knob maxed always. Start with the MIC knob halfway up for a few clean notes, then fading sustain as I dime the MIC control & torture my speakers ;-)

Ears too.

It is a little unstable at full volume but I thought it had potential, so I started tinkering with the circuit, I'll let you know when it's an actual guitar amp. I decided to leave the tubes as is and let the 6BQ5's self-invert, changing relatively few items and expecting it to be even better as an office PA than originally.

Until then I did get the stock voltages and as soon as I get more time I'll update the drawing and correct it as well.

Good Luck,
Mike

Replies:

rebel420 very cool... kinda wish i woudunldd... -- 3/13/2000 1:22 AM