Robin

That will do it, with a squeal in a new build or OT replacement, that’s the first thing to check.

Did you find a six for your amp?

Jensen Falcon Jet 12. Eminence Cannibals Rex is good too but from what you said, I’d try the Jensen Falcon Jet.

Here’s the schematic for the switchable rectifier, build it on the back of the rectifier socket, using the 4 unused lugs. 1N4007 diodes work great.

Greetings,
You could try changing the cathode bypass caps (C8 & C9). Remember you’ll have halve or double the value of the cap to hear an appreciable difference. You could also try lowering the plate voltage on the preamp tube to get a bit less headroom and add more grind. Also, you could easily add a solid-state full-bridge rectifier. It’s…[Read more]

I hope some of you were able to enjoy the free 4 week “introduction to tube amps”, webinar hosted by Gerald Weber, it was really good with a lot great info shared.

I hope some of you were able to enjoy the free 4 week “intoducition to tube amps”, webinar hosted by Gerald Weber, it was really good with a lot great info shared.

I hope some of you were able to enjoy the free 4 week “intoducition to tube amps”, webinar hosted by Gerald Weber, it was really good with a lot great info shared.

I hope some of you were able to enjoy the free 4 week “intoducition to tube amps”, webinar hosted by Gerald Weber, it was really good with a lot great info shared.

February 16, 2017, Tonight is the third “Tube Amp Webinar for the Novice” meeting presented by Gerald Weber. Last week there were over 90 attendees. Tonight night Gerald will discuss the different sections of a Fender Princeton circuit and explain how each one works and how they go together. The Power Supply, Preamp Section and Output section…[Read more]

Looking good! I can’t see your grounding scheme from the photos but isolating the power supply grounds from the input/preamp side will help keep the amp quiet. Run the grounds from the filter caps to the power supply side of the chassis, maybe to a lug on one of the power transformer mounting screws. And the preamp grounds together on the…[Read more]

Follow the instructions in this link: http://www.geofex.com/ampdbug/pwrtrans.htm
It is possible that the PT is blown but it’s also possible that it’s something else in the power supply, a bad tube can cause damage to other components. When a fuse blows, it’s not because the fuse went bad, use the light bulb current limiter you built when you…[Read more]

From time to time, the question of how to get more headroom with a Two Stroke comes up.
As the Two Stroke design is very much in the vane of a “black face” style amp, it’s never going to be as clean as some other designs. But the new Tung-Sol 7581A may offer a significant delay in the onset of breakup and provide a cleaner tone at higher…[Read more]

Hi tubessence, Welcome to TAN! One of Marlin’s books is now out of print, I think it’s the Designing Power Supplies… title, but much of the content of the books is posted on his website: http://www.valvewizard.co.uk/
His books are great. As you already know, Dave Hunter’s book The Guitar Amp Handbook is super too, my personal favorite for…[Read more]

Hi tubessence, Welcome to TAN! One of Marlin’s books is now out of print, I think it’s the Designing Power Supplies… title, but much of the content of the books is posted on his website: http://www.valvewizard.co.uk/
His books are great. As you already know, Dave Hunter’s book The Guitar Amp Handbook is my personal favorite for a tube amp…[Read more]