Tubes need to be shiny or black, that's called the "getter" and takes care of any micro-vacuum leaks. If they turn white then they are bad. Often times old tubes will be fine, except power amp tubes. You can pull tubes to isolate hum too starting at the first pre-amp tube, it won't hurt anything, this is useful to isolate problems. Check the screen resistors on the power tubes, and make sure the bias adjustment is working properly because tubes can run away with no bias and burn up. That's the most common failure point in old amps. Amps are my area of knowledge as I work on guitar amps for 35+ years. Glad to answer any questions you have. Check out Psionic Audio, Lyle is the most knowledgeable tech I know on TH-cam.
Where did you get the cap kit? I'm working on a Wurlitzer 3600, and the amp is on the list of things to fix... I think you mentioned that the cap kit covered multiple amp models, perhaps the extra caps are not used in this one, but are on one of the other models?
Just finished the video. I'm wondering if the speaker wire is bad/corroded. Also running the amp without a load on it is bad to do and can cause a flyback event. The volume control is suspect, and a good cleaning of it/them and all the connectors would be a good start. If that doesn't help then need to start checking voltages and resistors. It doesn't sound distorted so I don't think there is any issue with the output transformers or section that is catastrophic. It may just be a bias problem too causing low output due to being biased too cold.
Tubes need to be shiny or black, that's called the "getter" and takes care of any micro-vacuum leaks. If they turn white then they are bad. Often times old tubes will be fine, except power amp tubes. You can pull tubes to isolate hum too starting at the first pre-amp tube, it won't hurt anything, this is useful to isolate problems. Check the screen resistors on the power tubes, and make sure the bias adjustment is working properly because tubes can run away with no bias and burn up. That's the most common failure point in old amps. Amps are my area of knowledge as I work on guitar amps for 35+ years. Glad to answer any questions you have. Check out Psionic Audio, Lyle is the most knowledgeable tech I know on TH-cam.
@@ScottyBrockway awesome thank you for the information I’ll look into this is the first amp I have ever worked on
those leftover caps may be for building a multicap setup to replace those giant caps like a motorola monitor
@@garyrose7962 maybe good point
Awesome 👍
@@treetop.garage thanks
Where did you get the cap kit? I'm working on a Wurlitzer 3600, and the amp is on the list of things to fix...
I think you mentioned that the cap kit covered multiple amp models, perhaps the extra caps are not used in this one, but are on one of the other models?
@@MrConradF that’s what I was thinking with those extra caps and the place was called jukebox Friday night
First! Hey, have you been getting my text messages on your fancy new phone?
@@overtimearcade no I didn’t do you have my number
@@troylukans2174 I just sent you an email.
Just finished the video. I'm wondering if the speaker wire is bad/corroded. Also running the amp without a load on it is bad to do and can cause a flyback event. The volume control is suspect, and a good cleaning of it/them and all the connectors would be a good start. If that doesn't help then need to start checking voltages and resistors. It doesn't sound distorted so I don't think there is any issue with the output transformers or section that is catastrophic. It may just be a bias problem too causing low output due to being biased too cold.
@@ScottyBrockway ok thank you I’ll start cleaning the volume pots first