✪ 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
Reverb for Your Car1,2
Demco (1966)
Controls: (1) Front panel control= Front/Rear; (2) Internal 1K level;
(3) Internal output balance.
Kit Details: Soldering kit. Bare PC board & parts. (Competitors use
point-to-point wiring.) Fits any negative ground vehicle. 6
transistors. 2-1966 Popular Electronics article1 provides
details. Corrections in 4-1966 PE.2 Output: DE (complementary)
Design: Under-dash control & trunk-mount
tank & reverb amp.
Mini-Verb3
Demco (1967)
Controls: (1) Front panel control= Front/Rear pot w/pull-on, push-off feature; (2) Internal 1K level;
(3) Internal output balance.
Kit Details: Soldering kit. Bare PC board & parts.
(Competitors use point-to-point wiring.) Under-dash unit contains control, mini-tank & amp.
Fits any negative ground vehicle. 6 transistors. 5-1967 Popular Electronics article4
provides details.
Output: DE (complementary Darlington/Sziklai)
Design: Under-dashboard. Smaller size cabinet than 1966 kit.
Solid-State Reverb Unit4
Kneitel & Brown book, 1968
Controls: (1) Front panel control= Front/Rear; (2) Internal 1K level;
(3) Internal output balance.
Available data: Parts list, diagram, & notes. Construction method up to builder.
Part Details: Fits any negative
ground vehicle. 6 transistors. Same circuit as Meyer 1967 kit. Output: DE (complementary Darlington/Sziklai) circuit.
Design: Under-dashboard
Verba-Phonic5
Patrick H. Smith, PHS Collector Car World
Controls: (1) Front panel control= Reverb/Nornmal; (2) Balance Fader;
(3) Level
Available data: Parts list, diagram, & notes. Construction method up to builder.
Part Details: Fits any negative
ground vehicle. 6 germanium transistors (obsolete). Similar to Meyer 1966 kit,
but no silicon transistors. Output: DE (complementary Darlington/Sziklai) circuit.
Design: Under-dashboard control unit, w/trunk-mount tank & amp
*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
Daniel Meyer,
“Reverb for Your Car,” Popular Electronics 25, no. 2 (1966): 50.
N.A., “How to De-Bong Auto Reverberation Unit,” Popular Electronics 24, no. 4 (1966): 20.
Daniel Meyer,
“Build the Mini-Verb,” Popular Electronics 26, no. 5 (1967): 41.
Tom Kneitel &
Robert Brown, 101 Easy Audio Projects (Indianapolis, IN: Sams Technical Publishing, 1972),
46-48.
Patrick H. Smith, Tech Series: Make Your Own Reverberator Unit!
http://phscollectorcarworld.blogspot.com/2017/02/tech-series-make-your-own-reverberator.html
(accessed February 13, 2019). Post date for this site is February 7, 2017.
♦ 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.