Tube Amp Archive

AB/Y into 18 watt only is OK. I have used this for a year to select/combine channels. AB/Y pedal only, into 18 and another amp = squeal. Either Fender or Two Stroke for the other amp. AB/Y pedal only, into Fender and Two Stroke = ok. Stereo volume pedal by itself yields similar results as AB/Y pedal.

More test results: the 18 Watt does not play well with others. It squeals with any combination of the Fender or the Two Stroke.

The Fender and the Two Stroke are fine together.

I vaguely remember reading that you could not daisy-chain the channels on a Fender, but not sure that would be applicable here. After re-reading this I think you cannot daisy-chain the 2 channels on the Fender because they are out of phase. I have only tried the "vibrato" channel on the Fender - no...

Yes, the 18 runs fine by itself with full pedals, etc.

More testing this evening.

Thanks Nick. These are on the same A/C outlet, with no connection to mixer or anything else.

I was under the impression that pedalboards using a 9VDC power supply were isolated through the transormer in the power supply.

I will look into the Ebtech product.

Thanks for the ideas David. Tonight I will try a ground lift on one of the amp power cords to eliminate a ground loop. I also have another amp (David Hunter Two Stroke) to try in place of the Fender.

I am trying to run two amps in parallel but get a loud squealing from the 18watt when I turn up very loud. One amp is an 18 watt Ceriatone/Marshall TMB-EF86 and the other is a 1971 Fender Super Six (basically a Twin). My desired end result is: wireless output into pedal board, 2 outputs from Boss DD...

I replaced the Weber W022772 power transformer with an Allen TP25, which is billed as an "Upgrade Power Transformer for BF/SF Champ™, VibroChamp™, Bronco™, and Princeton". I played 2 sets last weekend without smoke or loss of power and will try again this weekend. :lol: It sounds like a might be a t...

No pedals. My ES-125 TCD was plugged straight in, turned up to about 3 or 4. The amp was chest level, about 3 feet behind me so feedback was a constant issue - trying to keep it as controlled sustain and not a runaway banshee!

I have pushed it much harder with other solid body guitars.

Structo wrote:How close is the power transformer to being maxed out?

How would I check that, Tom?

First 2 filter caps are axial Sprague Atoms; 20uf/500v & 16uf/475v. No signs of distress on either.

Sockets look clean. Resistors look and measure ok right now.

Ha - you guys are harsh! I was only drinking Mountain Dew & not even smoking anything! :lol: The last chords of One Way Out were ringing but I had nothing. Did not inspect closely at that moment, but there were definitely some wisps of smoke from the amp, and quit as soon as I turned it off. Sniff t...

<Were you pushing that Two Stroke maybe a little too hard on that set? > Ha ha! Come on Mark - this is rock and roll! The volume was around 30% which was pretty loud, but I have played other sets where I had it dimed and my poor little 10 watts was not keeping up with the other guys! It was dead at ...

All good points Tom, thanks. Will do some checking after work.

I do have the OT switched to 8 ohms and running into a single 8 ohm speaker. The OT is a Weber WSE15, I believe 5K on the primary.

Thanks Cliff. I will double check ratings on PS components. The PT is a Weber W022772, rectifier is 5Y3 and was using a single KT66 power tube. I have the PT switched so I can use the 120 or 125 primary winding, and had it on the 125.