✪ CAUTION. The reverb circuits on this page aren't guitar stomp boxes! Don't try
to adapt them for guitar. Guitar reverbs require a reverb tank driver on the input of the tank. (This tank
driver is an amplifier with a high impedance front end.)
Reverb Name
Brand
Comment
Unknown
American Motors (1964 Rambler American Classic)
Controls: ?
Output: SE
Part Details: Under-dash control panel. Tank & amplifier in trunk.
2 transistors; transformer-coupled preamp & power amp. Transformer-coupled speaker.
May be Motorola circuit, as in Ford Studiosonic.
Golden Touch
Chrysler (Imperial), Mopar
Controls: Front/Rear, pull on
Output: ? (Probably SE) Part Details: Dodge & Plymouth used Motorola Vibrasonic reverb units.
Revbra Phonic
GM, Delco
Controls: Separate control & trunk modules.
Manufacturer: Gibbs
Output: SE
Part Details: Power transistor= Delco DS-503 (germanium) in TO-3 package on short end of chassis. Other
end has three lugs for wiring to cockpit. Chassis uses 2 transformers (likely auto- transformers): Probably
interstage (between transistors) & output (to speaker). Large power cap.
Product Details: 2-module reverb, with tank in trunk. Likely similar to Vibrasonic circuit. Includes PC board
for 1-transistor preamplifier. Rest of wiring is point-to-point (typical). 3 sides of chassis are sheet steel. One
side is heavy-gauge cardboard (typical). May be similar to Vibra-Tone, another
Gibbs brand.
Tank: 2 springs
Studiosonic, Studio Sonic, StudioSonic
Ford, Motorcraft
Controls: 1 pull-on pot (front/rear mixer) w/2 cams for on-off sw.
Manufacturer: Motorola. (Same as GM Vibrasonic.) Output: SE
Part Details: Earlier version had under-dash pull-on balance control.
Tank & amp shock-mounted in trunk.
Vibrasonic
General Motors, Delco (Pontiac)
Manufacturer: Motorola
Part Details: Probably same as Ford Studiosonic, Vibrasonic R200.
But Gibbs made GM Revbra Phonic. (See Revbra at Aftermarket Reverbs.) Output: SE
*Notes
1. DE= Dual-ended (Class B or AB, complementary) output, 2 power transistors.
2. F= front; R= rear.
3. L-R= Left to right
4. SE= Single-ended (Class A) output, 1 power transistor.
5. TO-3= Large power transistor with integral heat sink & mounting flange.
6. Xfmrs= Transformers
♦ NOTICE. If you'd like to contribute ideas or suggestions,
email me. Submitted ideas and suggestions become the property of
Hawes Amplifier Archive. I try to mention the source of
anything I use.
♦ NOTICE: FURTHER INFORMATION. The details that I have appear on these
pages. As I learn more, I'll add more data. Please don't email me for more
information.
♦ NOTICE.None of the reverb units on this page is for sale by me.
You might find one on eBay, though.
♦ NOTICE: Repairs, Modifications. Buy a Sams PhotoFact (schematic)
set on eBay. I don't have, nor do I provide schematics. I don't repair or modify
reverb units.