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Quote from: saturated on April 09, 2024, 05:20:43 AMThank you sir I am glad I did not have to touch any power tubes...in the back of my mind I had heard about tube biasing and was dreading having to do something like that. But I looked it up and evidently preamp tubes are just plug and play...?
The two 12ax7 I switched positions were in there really tight. To avoid broken glass and blood I put on a leather work glove.
I really appreciate everyone's help with this idk what we did but it's sounding really crazy nice it still has a little hum at low volume but I ain't touching it right now.
Quote from: g1 on April 11, 2024, 12:24:42 PMQuote from: RookieRecurve on April 11, 2024, 10:09:19 AMMy main concern is with the ground. I am unsure if sharing a ground with an external amp and an internal amp would cause any issues?It can cause issues with ground loops or worse. Some amps require their output (-) terminal to be isolated from ground for things like current feedback schemes.
If you want it to be safe as possible, use a Cliff S2 style jack, which will be insulated from chassis, and also will allow switching of both the positive and negative wires.
Quote from: RookieRecurve on April 11, 2024, 10:09:19 AMMy main concern is with the ground. I am unsure if sharing a ground with an external amp and an internal amp would cause any issues?It can cause issues with ground loops or worse. Some amps require their output (-) terminal to be isolated from ground for things like current feedback schemes.
Quote from: Tassieviking on April 10, 2024, 03:33:55 PMThe safes way to do this is to add a socket behind the speaker that the speaker goes to directly.
Also a speaker out socket on the back of the amp chassis, then you need a short speaker jumper cable with a plug on both sides to attach the combo amp to the combo speaker.
Edit: I have done this to some of my combo amps as it turns them into a separate head and separate speaker cab.
Sometimes I want to play the Marshall through the Fender speaker or the Sunn speaker, I just un-plug and plug into another combo for the sound I want.
Quote from: Loudthud on April 10, 2024, 03:06:02 PMNot sure what you want to do exactly.
Is the combo amp like a Fender where the internal speaker(s) just plug into the back of the amp chassis ?
Are either of these amps tube amps ?
Franken amps are notorious for poorly done grounding. Do you get any hum when you just connect a wire between the chassis' ?
You might risk damage to one or both amps unless they are both OFF when you plug the cable between them. Can you do that or do you need to make this idiot proof ?
Quote from: Tassieviking on April 10, 2024, 03:54:51 PMI think the best way to go forward would be to inject a clean signal and check the test-points with an oscilloscope.Thanks!
Being a SMD build it gets a bit harder to check and replace components.