The Amp Garage

johnnyreece wrote: ↑Tue May 07, 2024 1:47 pm My range is now (from memory) 2.6-4 Hz on slow, 3.9-9.6 Hz on fast.

That's a very useful frequency range.

That's the same schematic I have. All four pots in this snip are connected to ground. The 2.2K cathode resistor is also directly connected to ground. The 2.2K does not have to go through the bass pot to get to ground. Could it have been drawn more clearly? Absolutely. But that's not the Gibson way! ...

Phil_S wrote: ↑Mon May 06, 2024 7:42 pm You still have the bass pot grounded. That's a mistake. The bottom lug goes to the 2.2K and then the PI.

That's not what my schematics show. That 2.2K is the PI cathode resistor and it connects to ground. Same for the ga50 and ga50T. Has nothing to do with the bass pot.

will I need to mod the bias supply and, if so can I still get enough range to be able to return to 6L6 when wanted ? Also what If I connected a 8ohms load ? The SR sets the bias voltage to -52V. The DR sets the bias to -35V. If your bias pot can swing as low as -35V you're OK. Otherwise, a simple m...

Saywhat71 wrote: ↑Fri May 03, 2024 4:07 pm I just plugged a mixer into my light bulb limiter and the bulb lit up fast then faded. Is this normal?

Probably. But brightness is relative. All depends on the normal current draw of the device under test and the bulb wattage.

Lastly, I used the signal generator of an oscilloscope to send a sine wave thru the amp. I connected the scope to the grid of V1A (12ax7) and I get a normal sine wave. I turn on AC coupling and connect the scope to the Plate of VIA, I get a clipped sine wave. (photos attached). The clipped Sine wav...

Build something that uses the same output tubes as the donor amp.

hebaton wrote: ↑Tue Apr 30, 2024 9:59 pm THe amp I am looking at is a 1990 !

Why do you say it is a 1990? Fender was not making any Deluxe Reverbs at that time and the Reissue did not go into production until 1993.

hebaton wrote: ↑Tue Apr 30, 2024 9:59 pm THe amp I am looking at is a 1990 !
THe label inside ( tube complement ) says : Deluxe Reverb-Amp AB763

Show us what you are looking at. The AB763 Deluxe Reverb was only produced between 1963 and 1967!

https://ampwares.com/amplifiers/fender- ... xe-reverb/

I asked Bing Copilot, "When did Fender release the first 65 Deluxe Reverb reissue?"

Copilot replied, "Fender introduced the '65 Deluxe Reverb reissue in 1993."

The manual I posted was dated 1993.

I'm pretty sure the pots are on a separate pcb.

Thanks Martin. I really like yours too!

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