The Amp Garage

Go for it. I've built a couple non-traditional Express amps. Follow good lead dress, and you'll minimize possible oscillations. You may have to add some grid stops if there's trouble. I felt the need to dump a bunch of gain in the early stages, because, DAMN there's a lot of gain. And then, plan to ...

Balancing the load will get you the most power output. So, two 8 ohm speaker cabs wired in parallel makes a 4 ohm load, and you should set the selector to 4 ohms. Sure, you can run a mismatch if it sounds better to you. You'll get a bit lower output, possibly earlier distortion (but only if you're p...

Pretty in purple.

pdf64 wrote: ↑Fri May 31, 2024 2:29 pm Why use standby?
There's no technical need or benefit in doing so.
Just switch the amp power on or off, as required.

Pete, I think we need some merch. T-shirts and bumper stickers that say, "NO-STANDBY CLUB" or some such.

Colossal wrote: ↑Mon May 27, 2024 1:59 pm I actively monitor all posts in the morning hours and routinely delete spambot postings and accounts. Xtian is now the site admin.

I am now a site admin--I also log in every morning at about 9amPT, delete spam, if any, and admit new user requests.

Oh, dear. With great success comes...lawsuits. I'm just guessing. But, reading between the lines...

Dig it! Please show your CNC and link to buy!

The Fender Bassman RI (tweed 4x10) has a 3A fuse (accessible outside chassis) followed by a 4A fuse in series, inside the chassis. Strangely, the 4A fuse had gone open when the client brought it in.

So, the input to this module is 120vAC wall voltage? And rectified output is 350vDC?

You are nuts, and I salute you!

You even made a hardwood dolly!

Width of cutout for chassis should be 0.25" wider than chassis for a snug fit, or +0.3125" for some breathing room.

Just because an outside power line runs close does not suggest noise or poor AC from utility. A scope would be userful for examining the AC.

To answer second question, Spark amps from positivegrid.com are pretty cool practice amps.

ijedouglas wrote: ↑Tue May 07, 2024 8:07 pmAdmins, can we move this thread to the Discussion section?

Done.

Wild! Thanks for posting!

Sounds correct. Typically, the bulb will get bright right at power up, as the reservoir filter fills, then it should fade.