BassmanPaul

Make sure the cabinet you use matches the output impedance of the amplifier. IIRC that's 4Ω.

The Yorkville factory is a couple of miles East along Kingston Road from my home. they use Hammond transformers and always supply proper documentation and service manuals for their products. They are very reliable and don't sound bad at all.

<Sigh> Nice bit of quality diagnosis there! 🙄

Sad to say that I have a four channel 300W per sitting in my garage. If you were nearer I would have given it to you.

When I left the UK in late 1973 I brought with me both transformers from a SC150. I designed an amp around them and gigged it for a while before I sold it and went SS. I have to admit I loved Partridge transformers!

Then you have no choice but to stow it in the trunk! LOL

See if connecting the Effects Loop Send and Return with a signal cable helps any. An intermittent in the switches here might give what you describe.

Like most countries, Canada has it's problems. Here in the Greater Toronto Area we have our share of gun crime but not at a level as the US. We arrived here in late 1973 and Canada has been mostly kind to us. I ended up working for our electricity generating utility. Now retired I have a reasonable pension and an excellent health benefit plan that covers just about anything.

Me too! Especially after they banned me! LOL

Each vertical row of knobs constitute a channel with the sockets under them high impedance inputs for each channel.

If the amp has a dedicated headphone socket you pretty much just plug your headphones into that. Impedance is not that important when talking about headphones.

I believe that all Trace amps delivered their maximum power into 4Ω. Usually a combo will house a driver of an impedance to allow the amp to give it's max.

LOL I remember those old PA amps from back in the day. As for the TB50 it simply didn't have the power to produce a reasonable volume without distortion. Some folk like Lemmy just went with the crap and made it part of their sound. The engineer in me could not so I started on my quest to sound like a bass and not a distorted low tuned guitar! If you like what the TB50 does for you more power to you - enjoy.

The acme B2 2x10 is a three way design and I own four. I use two of them in a vertical 4x10 stack and they are wonderful. I can hear them easily and have no desire to migrate to another make/style of cabinet. The way they handle my Low B string has to be experienced!

I doubt it. Laptops and amplifiers are completely different animals and need vastly different diagnostic methology and tools.

@goingdownslow how's my old city doing lately? My four brothers are visiting us in a couple of weeks. Can't wait for their arrival1

You need to desolder the terminals of the jack using a 'solder sucker' then ease the socket off the PCB. Probably Hartke will be able to supply the correct replacement.

So THAT'S how I became a Diabetic!!

As have I.

You have to remember that power is not linear. If you have a 100W amp and you want to get twice as loud you would have to step up to an amplifier capable of outputting 1000W, that's a ten fold increase.

If the afore mentioned Class D amp has an effects loop plug the tube pre-amp output directly into the Return jack.

What tools/experience do you have?

Well I wish you luck with that. Perhaps it might meld harmoniously.

I used 12swg for my speaker cables mostly because after installing my landscape lighting I had many off cuts left over. I also agree with only using SpeakOns. 1/4" Phone jacks just can't safely handle much more than a couple of hundred watts. They also can short out the amplifier if pulled part way out of the socket. I switched all of my equipment to SpeakOns years ago and have never regretted the move.

Buy the proper foot switch. It's easier and simpler in the long run than messing about trying to McGuyver something.