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swyse - Probably no worky getting a good reading from the trimmer while its in the circuit. Also, it is VERY sensitive. A slight twiddle either direction can mov the B+ from 150v to 300v so jostling the board around would probably alter the trimmer setting. I need 250v so knowing that I...

Do you have any preference for running time based FX before or after your preamps? I am planning on using an HX Stomp for time based FX and am planning to put it after because a) I often read that's generally preferrable and b) so that it could also function as an cab IR host and provide the...

Got the HV PSU hooked up to my preamp. Is there a way to replace the trim pot with fixed resistors in order to yield a 250v HV value?

I've just completed a blackface Fender tube preamp (thx to @vigilante398 for the guidance) and have run it thru a Seymour Duncan PowerStage 170 (EQ's @ noon) to the speaker cab in my Deluxe Reverb. Sounds good, but not as good as the DR. When I play with the EQ controls on the PowerStage the...

(y) Thx!!!

Building the HV PSU. The link to Tayda for the 100u cap is for a 25v unit. The BOM says "Set for desired input voltage" and the PCB itself has a large footprint more in keeping with the 400v 10u cap that sits immediately adjacent. But the schematic indicates it's taking 9v input to ground so...

I'm building a tube Fender blackface preamp with Sushi's HV power supply. I have watched a YT vid comparing Mallory 150's vs Sozo's and I'm a bit surprised by how audible the difference is, even on YT audio. The test is run thru two "identical" amps, each built with the competing caps in the...

Gonna just start over. The cost of the PCB and the light component count make it less of a hassle. Thx all!!

(y) Thx!

I was going to use an ohm meter to see if any of the solder joints bridged. Some "register", but that may be due to their placement in the circuit so I started to note them on a photo of the PCB from the BOM only to notice that the BOM layout appears different than the PCB I have. VIG, am I...

I've read about the need to a CLR due to the nature of batteries, but I would like to settle the question in a clear way.

The coin batteries are typically 3v. Any guess as to what type of current limiting resistor I need for a reasonably bright illumination?

I want to set up a remote footswitch via an 1/8" plug, just like an old school reverb foot switch found on an old Fender amp. I want an LED indicator to light on the remote, but don't want to have to run power all the way out to it if there is an easier solution by using a small battery in the...

Yes, I found the Scotch brand equivalent of the VHB. Had it left over from another goofy project. Appears to be just what the Dr. ordered.

Benny, I sent an inquiry into the 3M tech as to that very product. Awaiting a reply now. Know any sources where I don't have to buy an mega-duty sized spool of the stuff :rolleyes:???

Re: Hot glue. . . No worky. I have to adhere all 6 pots to the circuit board so that they can be handled as a unit. . . easier to install, etc. By the time I'd get them all doctored the first 3 would be cold already.

I have a terminal strip circuit board that I need to affix to the back of a matrix of pots so that they are bonded into a unit (but electrically insulated). The normal 3M double stick stuff I can get at Home Depot is ideal except that I'd love to find something with a stronger more permanent...

Like insurance. . . usually unnecessary, but when you need it you're glad you got it ;). Thx!

I notice that YouTube has a number of credible contributors insisting that modelers or analog preamps should be followed by a DI box then to FOH mixer. If the unit puts out a line level signal why the need for another piece of hardware?

Woo Hoo!!!! Thx!!!!