I’ve always wanted one of these so I built one.
Until then, I never realized how great sounding and versatile this amp is. It’s now a studio staple. We use it for everything; bass, guitar, organ, DI.
In many ways, it’s the sound of rock and roll. It’s Bootsy Collins, Phil Lesh, Jerry Garcia, David Gilmour, and Stanley Clarke in a box.
The circuit for this preamp has been around forever...
The MTI Rotophaser is a rotating tremolo horn speaker system made in Italy in the 1970s. It is similar to the top half of a Leslie cabinet.
These are somewhat uncommon to find and often the footswitch has been lost or damaged.
Since the Rotophaser won’t work without the foot switch and its tangle of cable,
I’ve drawn up some schematics for the MTI Rotophaser footswitch and posted them on this page...
The Shure M67 is a vintage four channel microphone mixer commonly modified for use as a four channel preamp in recording studios. First manufactured in 1968, these became a standard in the broadcast industry. The M67 was used to record Woodstock and many a tv news program. Still readily available on the used market, they remain relatively affordable...
Download our impulse response IR’s for this Premier 90 Spring reverb unit here:
Premier 90 Spring Reverb Impulse Responses
My mid-60’s Premier 90 tube reverb unit came to me completely unusable due to the extreme amount of hum and noise it produced...
Converting a 1962 Cordovox Accordion Amp to a guitar amp…
A brief build summary:
I’ve been able to learn very little about this recent acquisition. I’d be glad to hear from anyone who may have some information regarding this vintage tube amp.
I’ve drawn up a schematic of this vintage 50eh5 tube amp here.
The value of some components, such as the early ceramic capacitors remain inconclusive.
Although some features bear a remote resemblance to several known amplifiers, I con...
From the speaker date code and other clues, this is a mid 1957/mid 1958 Ampeg M-12 Mercury. Likely a product of Ampeg’s transitional period during their move to Woodside, NY. Definitely a special amp with lots of character. Groovy “Pollocked” grill cloth. Jensen Alnico 5 speaker. And no tolex here...
Found with components dating to no later than November 1960, it could be one of the earliest B-15N’s produced.
We’ve nicknamed it “Number 24” after the hand- numbered chassis.
As Ampeg began development of the B-15-N in the latter part of 1960, a few models were released lacking the more elaborate cosmetic elements typical of the B-15N...