And BTW, I also made a bass version of this pedal that has grind down to the low B on a five string that I will post on the Preamp section

Oops, put the wrong layout with it. The one posted was my first attempt to add a bax style tone stack to it (that failed), so ignore. Here is the correct layout. Mods, could you delete the layout from the previous post? Pretty please :tu:

Mods, if you want to move this over to the Preamp and Effect section where it probably belongs...

And for a distortion pedal you might enjoy with this amp, this circuit is based on Jack Orman's "Son of a too expensive boutique tube screamer" with the addition of a few other clipping arrangements. Without the clipping variations it is what Lovepedal "borrowed" for his Eternity model pedal. I have built a few of these over the last few years and it is voiced to sound pretty much exactly like my old Fender Bandmaster with everything dimed. It works well with both tube and SS amps.

Look on the schem to the left of Q13 (lower right) and you will see the bulb and ldr for the tremolo. If it is a separate bulb, just change the bulb, otherwise if it is a single unit wrapped together you will need a replacement for the unit. This is a common problem with old Fender blackface amps and easily fixed.

For those of you who are also putting together some old germ based effects, this simple device helps in determining leakage and hfe for germanium trannies. I built it one day when I was involved in testing and sorting a batch of a couple of hundred PNP and NPN germaniums I had acquired, and got to thinking about what I was doing, i.e. plug the transistor into the breadboard, power up, let it stabilize, take reading, hook the 2.2M resistor, take another reading, rinse and repeat etc. etc.

For the circuit I refer you to R.G.'s article on Geoefx about the tech of the Fuzz Face, his explanation is a lot more clear than I could manage in the space here. I had all the parts but the connectors in the parts stash, those came from Radio Shack.

For a quick explanation, the trim pot is a 5k set for 2.47k measured with my Fluke 8060a. Plug in the trannie, turn on the switch and let stabilize. The short leads plug into the meter. Labeling on the trace side shows orientation. Record the reading. The push button adds the 2.2M resistor into the circuit as per R.G.'s explanation. Take second reading, subtract the first and multiply by 100 for hfe. The circuit is normally set for PNP, for NPN reverse the battery and meter connections. It took me less than an hour to draw the traces with a sharpie, etch and then build the thing. I use a battery that is slightly used and measures 9.01 vdc, as R.G. says, close enough for our purposes. For purposes of illustration I have the battery in the PNP orientation and the meter leads in the NPN. It works like a charm and has been a time saver.

Try DiscoFreq's effects database. http://www.effectsdatabase.com/

The LFO setup appears to be one of the oddball aspects of this amp. From my first cursory examination of the circuitry, the power indicator lamp has a ldr mounted next to it, so my presumption is that it will flash at the LFO rate. The lamp, which is good, does not light up when the amp is powered on. If it gets it's drive from the LFO, that isn't happening. Until I get this thing traced and identify the LFO section I won't be able to say for sure. The foot switch jack seems to only control the reverb on/off as it is wired directly to the reverb pot with the tremolo activated by toggle switch labeled "Psychedelic Sound", although I have never heard trem referred to as that, and I lived / played through that era. It may be that switch activates some form of clipping, although I don't see any diodes on board I would expect to handle that so if it is it would be via the Fuzz Face mis-biasing method of generating distortion. I will have to reassemble it to see just what the switch does, if anything.

All 26 electros  have been replaced just due to the age of this thing. I don't trust them to be not dried out after 40+ years, so replacing them is kind of an automatic first step for me on anything this age.

Well, it's time to go shoot some board pics, with backlighting so I have traces and components and start building a scheme. It is a good thing that this is not a need it tomorrow project, I have a feeling this could keep me amused for a while.

I guess I'm being a typical newbie with my first post asking for help/info...

For a little background, I have been playing / working on my (and others) gear for going on 5 decades now, I first got into electronics so I would not have to pay someone else to repair my amps. Spent better than 4 decades working for phone company and a major US railroad as an electronics tech, retiring three years ago. Got into pedal building a couple years back and do them from the ground up, etch my own boards, populate and troubleshoot them until working. Have and use a variety of test equipment including DVM, o-scope, sig generator and a Tracker 2000 for in circuit testing. Have a pretty good idea which end is the hot end on my soldering stations. :cheesy: I have no problem reading schemes and tracing signal through just about any kind of gear. Lately I've been reading through Teemu's excellent book, and enjoying the read, if that tells you what kind of geek I might be. Thanks Teemu.

I have a few amps in the collection currently, including a pair of old Fender BF Bandmasters that I've rebuilt, but also have and enjoy three Fender SS amps, a pair of Champion 30's and a Deluxe 90. How come Fender puts B taper pots on their volume controls in the SS amps? Doesn't really matter, log taper pots are going in the 90 (just picked it up a week ago) and are already in the Champs. I changed the caps in the tone stack of the Champs to reduce their icepick tendencies.

But to get back to the subject of this post, I am helping a local shop repair an old 60's vintage SS Toby GTR amp. Everything in it works except the tremolo. From what little I've been able to find about these, they were made in Ft Worth TX in the mid 60's to early 70's by a jazz bass player who now has a speaker company that makes high end speaker setups. (tobyspeaker.com) Gabor Szabo played through one of the guitar amps  for the last decade of his career back in the day. There were less than 100 made total, so info is a bit scarce, and most of what little I've found is on the bass amps. From contact with the company, the electronics were made by Ramco, and the enclosures and speakers by Toby. There are no schemes that I have been able to locate through google,  I am just starting to trace the board, I figure that will keep me busy for the next day or three, but I just thought I'd check here to see if anyone had heard of these or had any info they could pass on. Most of the trannies on the board appear to be obsolete germanium, of course, but I do have a smallish stash of germs I can probably match as far as Hfe etc. to substitute if needed. I've got a pretty good stash of passives from all the pedal building (40+ pedals so far) I just need to make or get a decent schematic and I think I can bring this beauty back to life. Have not done any board pics yet, but if anyone wants I can get some camera shots done.

Thanks, and howdy y'all.
Bob