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I will check all the voltages of both tubes. If there is an imbalance, why would that create the problem? School is in. Thanks
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Mod, now speaker pops on shutdown
Hi, I am hoping someone can help with a problem. I modded a Vox AC-10C1 amp. The mod was to increase the cathode resistor (R8) from 120 ohms (posted) to...
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This problem is now solved. After more troubleshooting I removed the the filter cap in the power supply reg and filter. This looks like a cap problem so...
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Thanks for replying. I tried a 1M resistor to ground on the input. Then I tried a 1M in series with input. Reduced the pop as well as the wha sound level....
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POP goes the wha
A friend asked me to help a fellow guitar player with his problem concerning his wha. Its a Crybaby gcb-95 wah. I have reached the end of troubleshooting...
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Surfing the 'net, I found a mod attributed to Mr. Teese. It said you could change the pot taper by making one cap bigger. Really? So I tried it on my Crybaby....
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Thanks for all the replies. I followed Enzo's suggestions and it turned out to be the power tube grid resistor. R5 in the posted schematic. Changed it...
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Thanks for the reply Enzo. Will do as suggested and report back. Divide and conquer.
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Thanks for the replies. I swapped the tubes with other ones. Also Re are the cathode resistors. (summer heat) I found a schematic. Changes are R7...
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EVJ head - bacon frying sound
I am looking for help in fixing my Epiphone Valve Junior head. It has developed a sound like bacon frying. (no smell). The sound is there right after the...
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Thanks for the reply. Makes sense about charging the cap. Going nuts for a while there. A lesson learned.
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BJT buffer help
I built a buffer with an bjt. The emitter voltage shows up on the other side of the output cap. I changed the cap, (type and size), no change. I checked...
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I had a problem with electrical noise in my home. My home has the original panel which is almost 50 years old. The contacts on some of the breakers were...
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Thanks for the replies. The objective is to lower the B+ by a fixed amount. The PT has an unused 12 V winding. What I am thinking here is using a switch,...
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Buck/boost? Yes or No?
I am looking to get some opinions about wiring a PT secondary for buck/boost. I am interested in the buck feature. Take an unused secondary winding and...
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Nut slots-angled or straight?
This is a question for those of you cut your nut slots. Do you follow the headstock angle or do you file parallel with the fingerboard? The nut does several...
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Thanks for the replies. I guess this is a case of much ado about nothing. The amp was a epi valve junior. Now it is a fender princeton 5F2-A with solid...
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SE bias too hot?
I have a SE amp using an EL-84 tube. Using one of the bias spreadsheets found on the internet, I measured my bias at 11.5 watts and 39.09 Ma. This is at...
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Not to be a smarty pants, but the resistors are SMT. I cant work with those. I was thinking of adding a resistor between the switch and board. Anyone have...
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