The Amp Garage

Out of curiosity, what does the amp sound like with the master on 10? Mine sounds terrible. Regardless of whether i implement this or not, I would like to have a somewhat usable amp through the volume sweep. I mostly played the amp with the MV on 10, but the volume pot was down below 5. I only play...

I just installed a 100K master volume pot in my single channel DR. Lets you control how much signal is sent to the PI. Works fine for me. Take a look...

https://sluckeyamps.com/tdr/tdr.pdf

imo1 wrote: ↑Thu Apr 18, 2024 2:10 pm Rob lists 1.9V AC as being the equivalant to 5.3V peak to peak. This is an error, yes?

No, Rob is correct. 1.9Vrms = 1.414 x 1.9 = 2.69Vpeak = 2 x 2.69 = 5.38Vpeak to peak

That's good.

The NFB wire to the board will always be connected to the yellow OT wire. When using KT66s you need to change R31 to 100K (see schematic).

You seem to be reading the color code wrong on those blue 5 band resistors. There are numerous places where you used a wrong value. I suggest using an ohm meter to verify the value of every blue 5 band resistor in this amp. Replace with correct values. The attached pic shows an example. There are mo...

You installed 470,000Ω screen resistors instead of 470Ω. Gotta correct that before the amp will make any joyful sounds.

Oddvar R wrote: ↑Thu Apr 11, 2024 6:46 pm I also ewxpected to see som CT's.

The white wire is a CT for the high voltage winding. There is no CT on the filament winding because there was no CT on the original Fender 125P7D PT filament winding.

The blue wire is the bias tap. Check to be sure you get resistance readings from the blue to each red and also the white to confirm.

The input jacks do not connect to V1 plate.

Hawk usually has best prices in Hammond stuff...

https://www.hawkusa.com/search?search=1 ... er_page=10

A1Sensei wrote: ↑Sat Apr 06, 2024 5:50 pm All of the power tubes went dark and came back on together.

That should happen because the filaments are connected in series.

I usually check the power supply operation before installing the board. That includes plugging in all tubes to be sure all filaments light up. Don't forget to drain those filter caps! Even better, permanently install a 220K 3W resistor across the first filter cap to always drain whenever the amp is ...

What attracts you to this amp?

Stevem wrote: ↑Mon Apr 01, 2024 3:41 pm What is up with that rectifier tube used in that schematic?

It's Weber's WZ34, a solid state plugin replacement for a GZ34.