Is my O.P. transformer fried
Moderators: pompeiisneaks, Colossal
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Gibsonman63
- Posts: 1033
- Joined: Wed May 27, 2009 1:59 pm
- Location: Texas
Re: Is my O.P. transformer fried
The light bulb limiter is really easy to put together. Go to Home Depot and get a large plastic electrical box, a receptical and a small box mounted light fixture. You will also need a power cord. Incoming hot, goes to hot on the receptical. Incoming neutral goes to neutral on the light fixture. Receptical neutral goes to light fixture hot to complete the circuit. Incoming ground goes to ground on the receptical.
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timwhite76
- Posts: 22
- Joined: Tue Nov 15, 2011 2:49 pm
Re: Is my O.P. transformer fried
[quote="Firestorm"]In this amp, the standby switch is located on one of the HT secondaries, so with the amp in standby mode only the tube filaments, bias supply and the +/- 16V supply for the op amps are getting any juice. Since the fuse didn't blow in that scenario, you are likely looking for an HT problem.
If there's a proper short, you can find it with your DMM. If it's an arc, probably not. Start with the OT: Discharge the caps, pull the connector from CP18, then put the plus lead from your meter on the CP18 connector (where you removed the CT wire) and measure resistance to ground. It should be infinite. If it isn't, check the OT protection diodes. Let us know what you find.
At some point, you'll have to decide how deep you want to get into this thing. If you can't pin down the problem by measuring from the connection points and examining the leads, you may have to pull the PCB from the chassis, which is a PITA. These amps were not designed for serviceability; they were designed for ease of assembly.[/quote
HT problem, what do you mean HT?
If there's a proper short, you can find it with your DMM. If it's an arc, probably not. Start with the OT: Discharge the caps, pull the connector from CP18, then put the plus lead from your meter on the CP18 connector (where you removed the CT wire) and measure resistance to ground. It should be infinite. If it isn't, check the OT protection diodes. Let us know what you find.
At some point, you'll have to decide how deep you want to get into this thing. If you can't pin down the problem by measuring from the connection points and examining the leads, you may have to pull the PCB from the chassis, which is a PITA. These amps were not designed for serviceability; they were designed for ease of assembly.[/quote
HT problem, what do you mean HT?
Re: Is my O.P. transformer fried
HT=High Tension (in British parlance). Means high voltage versus the 6.3V filament supply and the +/-16V supply for the solid state. The windings off CP11 and CP12 followed by the B+ supply coming off the diodes.
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timwhite76
- Posts: 22
- Joined: Tue Nov 15, 2011 2:49 pm
Re: Is my O.P. transformer fried
Is there any chance at all that this was just a bad Power tube, and fixing it (after replacing any burned component) is just putting new tubes in and properly biasing them.
I figure if this becomes to big an expense, ill either build just a amp, salvage what I can from this one, and use the cab.
I only owned it for 2-lousy days. I traded an Egnater Tweaker for it because I needed a higher Watt amp immediately. I played it for several hours the first day. Day two, a guy came to pick up the pedal I built him, I turned it on, let it warn up for a couple minutes, took it off standby, it crackled, and died. The kid wont take it back, he's using the argument that I mod things, so how does he know I didn't do something to it. The only mod done was by him, he replaced a pot with an audio taper one. He did agree to pay half the repair though, and I kept the email when he said this in case he tries to say he never agreed to out
It.
I think I can built the limiter out of an old lamp I don't use, plus an old extension cord.
I figure if this becomes to big an expense, ill either build just a amp, salvage what I can from this one, and use the cab.
I only owned it for 2-lousy days. I traded an Egnater Tweaker for it because I needed a higher Watt amp immediately. I played it for several hours the first day. Day two, a guy came to pick up the pedal I built him, I turned it on, let it warn up for a couple minutes, took it off standby, it crackled, and died. The kid wont take it back, he's using the argument that I mod things, so how does he know I didn't do something to it. The only mod done was by him, he replaced a pot with an audio taper one. He did agree to pay half the repair though, and I kept the email when he said this in case he tries to say he never agreed to out
It.
I think I can built the limiter out of an old lamp I don't use, plus an old extension cord.
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timwhite76
- Posts: 22
- Joined: Tue Nov 15, 2011 2:49 pm
Re: Is my O.P. transformer fried
Got youFirestorm wrote:HT=High Tension (in British parlance). Means high voltage versus the 6.3V filament supply and the +/-16V supply for the solid state. The windings off CP11 and CP12 followed by the B+ supply coming off the diodes.
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timwhite76
- Posts: 22
- Joined: Tue Nov 15, 2011 2:49 pm
Re: Is my O.P. transformer fried
Gentlemen, IM the living embodiement of the difinition of insanity; doing the same thing over and over expecting different results. I just agreed to trade my Blues JR for ANOTHER Deluxe Hot Rod. Only difference this time is i got him to agree to leave it at my house for the weekend so I can put it through its paces, and put n writting that if it dies in the next 90 days, he'll trade back no questions asked. Unless of course its someting I did to cause it to break, like drop it off a building or something. My hope now is to fix the brokend one, and trade both together for 1 real decent amp. All I really want is a Dleuxe Reverb, Or something like it. I have a Carol Ann OD that i loaned to my friend on tour ( i know i'll end up regretting it). If you ever get a chance to play one; do. They build them 2 towns over.