model r200 is 1957
r300 is 6sn7 6v6 5y3
Model # is r500c.Tube configuration is 12ax7 ,12ax7,6bq5,6bq5,6ca4.Jensen 10" speaker.Works The date code is 220307.Transformer code is a-1032,a-1069
r600 112 Combo 2-6v6 2-12ax7
r600c - Two 12ax7's, two EL-84's, a 6AU6 and a 6CA4 ( which Two-Rock's guys traded for a solid state rectifier instead). I've seen this same model number, 600 C, with two 6V6's, though I haven't heard it, and I've seen listings for an 800 C. The earliest I've heard of this amp being manufactured is 1960, mine is stamped 1965 inside, and I've seen a listing for a 1967.
sd400 - All tube, class A power section. It has been modified. Tubes 6CA4-1, 6BQ5-2, 6AU6-2, 6AV6-1. 2 channel with tremolo. 4 input- A,B,C,D. 2 output. RCA-type tremolo footswitch input. 3 way channel switch- ch. 1, trem 1+2, ch.2. Pots 2-volume, 2-tone, 1-speed, 1-modulation. 2-amp fuse, jewel light, standby switch. Point to point wiring.
Lectrolab R600 112 Combo
The amp has two channels, each with two inputs, as well as a tremelo. The amp also has a 12" speaker.I think the amp is late 50;s.It has 6v6 power tubes. 12AY7 preamp tubes.6SJ7 tremolo and 6X5GT rectefier.1/4 A volume and a tone knob for each channel and speed and intensity controls for the trem. Each of the inputs for each channel drives the power amp at differnt levels. The guy i bought it from told me lectrolab made all the early gibson amps.
1967 Lectrolab, w/2 x EL84's, w 1 x 12" (Jensen P12R), tremolo, amp compresses sooo cool!
Lectrolab R500C
Lectrolab R500C The brand name on this amp is virtually unknown, but it says "Cicero, Ill." on it so we bet its a Valco amp. No matter, the fiberboard cabinet, the dual EL84 output section and the low gain pre-amp coupled with a new Jensen C12 makes for a pretty cool little amp. Not very crunchy, but nice, fat and warm.
Lectrolab Model R600B 2 chanel with vibrato.Itis 65watts input and it drives a 12" speaker that appears to be a jenson, The speaker has the #'s 226025 p12rc65143. It uses The following tubes,2-6v6, 1-65h7, 1-5y3, 2-7025 12ax7.
Buy the Book!
I cleaned up my tab for Sonny Boy's Help Me and made it into a short book. There's a Kindle version for 99 cents, and if you buy the paperback you get the Kindle free.
