Hi Mr Phil nice to hear from you thanks 

As embarrassing as it is I have to confess because I'm learning here it seems that what I saw and thought was coating or residue on the inside of the tube is a simply a component of rectifier tubes known as the

Insulating spacer

The little points on the circle threw me off.

Anyhow I haven't done anything to this amp whatsoever but I am going to today.  Today's plan

Remove chassis again and reconnect speaker (I think this is a big deal on tube equipment as in components can be damaged?) 

Reconnect reverb tank and see if dark tube lights up.

If dark tube doesn't light up then swap with another.

If that tube socket remains dark then very carefully do as suggested by the mighty G1 and try to get a voltage reading on the heater supply purple and white wires ?
(Quick edit...purple and RED wires )
Also I was wondering what the 🐶🐕 doghouse is all about I presume that's where the power supply capacitors are and maybe the voltage ⚡ is dangerously high and the doghouse protects people...idk.

 

I corrected that above, yes it was just a typo. Voltages are correct for the given transistors.

Do you have those reversed or is it a typo?  T4 should be the TIP29.

That's not the right schematic for the G.  It's actually for a 1000S (printed on sheet).
100G schematic attached.  Shows 600 ohm impedance for the tank so 4EB2C1B tank should work.

Had a few other projects to tend to, but finally got around to getting those voltages.

T6 MJF122
E  34.6V
B  35.5v
C  35.1v

T4 TIP29
E  -39.5v
B  -39.2v
C  35.2v

Cool looking amp 

Might be time to get or build a dim bulb tester. 

Welcome to the forum

 

Today I hooked up the borrowed Boss distortion pedal between a guitar and the RETURN jack on the amp and the distorted sound of the guitar was present. Of course all of the amps front panel controls were inoperative. I also tried plugging it into the front guitar input  jack again with the same results as reported in my first message. Does this indicate the problem is in the preamp section?

Have a look here: https://www.radiomuseum.org/r/klingentha_regent_30_2_r302.html

Hello! I bought an amp chassis on ebay and bit off more than I can chew.

It is a Sound City SC100R, without speakers and reverb tank.
I would like to turn it into a head. The amp is very appealing because all components are laid bare and there are no ICs.

Attached is the schematic and some other blurb about the amp.
Also traded as Londoner L100 and Sound City SC100R
https://www.vermona.com/support/vermona-heritage/ search for 100G

Which Reverb tank works with this amp?
How do I go about checking the device over without getting killed in the process?
Cheers,
Bernd.

Hi Guys! Have I got your amp through ebay? Anyway. I have one and I struggle to justify the potential costs of repair. Did you get it fixed? Got professional help? I want to turn this amp into a head. Need to understand the slave output and external speaker wiring. The reverb tank is also absent. Do you know the specs for the reverb?
Here re some photos.