Month: November 2024
BELL & HOWELL: Model 601 Amplifier Conversion Project
When I started this project, I knew some people prefer to keep these amps stock. However, running something with electrolytic capacitors from 1948 seemed like a disaster waiting to happen. If one failed, it would be a nightmare to fix. In fact, if anything failed, the cramped design would make repairs extremely difficult. On top … Read more
BALMORAL ELECTRIC: Set of Tone Benders (MKI, MKII, MKIII)
Just to offset the amplifier posts for the pedal folks – here’s a set of three Tone Benders that I just finished. By a set I mean a MKI, MKII and a MKIII – and no I did not include a MK1.5. The layouts and info on how to build these can all be … Read more
BELL & HOWELL: Gaumont, Model 601 Projector Amplifier, 1949
I know, I know—this is starting to drift even further from pedal circuits with each post, but stick with me for a moment. These old Bell and Howell projector amps have quite the following, so I’ve been keeping an eye out for one for a while. The catch is, they don’t pop up on the … Read more
Earthquaker Devices Disaster Transport
I traced this one a while back. It’s the same delay circuit as the Disaster Transport Jr but with modulation added. It fits nicely in a 1590BB like the original. Schematic here. If you’d rather a smaller footprint I have fabricated boards for a 125B in the store.
HAMMOND: 1751M Output Transformer Datasheet
From the Hammond 1750 output transformer series, this is listed as a drop-in replacement for a Fender Vibrolux Tweed, 5F11 – they’re supposed to look similar to the original Fender transformer where possible. That being said – this sticks out like dog’s balls when mounted on a crusty old amp. Materials etc are also supposed … Read more
THIRD MAN: Fuzz A Tron
If you’re in the USA, for $75 you may as well buy the kit. otherwise, this should be a really simple build. THIRD MAN FUZZ A TRON VERO LAYOUT Spoiler alert – it’s a modded Fuzzrite. 330k resistors instead of 470k, and it’s missing a resistor that formed a high-pass filter on the output of … Read more