Standell "The Imperial" ss Gt. Amp

[Lou Popadoo]

This is a 2 pronger.  Also it helps if i set my scope up as you asked.  When I set it to AC coupled I'm getting 265mVAC at point "C", no AC at point "D", and 333mVAC at point "B".  It definitely looks like I'm getting oscillation at the point I marked on the last attachment, as well as at the Collector of Q4. Also the footswitch and the Intensity and Speed knobs appear to be effecting the signal at Collector of Q4 properly.  All voltages are nearly spot on.

[shooter]

looks like I'm getting oscillation at the point I marked

the problem is what freq it osc.  looks to be at 60hz instead of 6hz.  So either you are just seeing ripple from the mains power, or you have built a a 60hz osc instead of a 6hz one.
spend some time verifying the AC at point C, is or is not the same as Q4's collector. 
PRR shows a period time for 1 sine wave ~~~150ms, that is the ballpark you want with enough amplitude - guessing 3-8vac p-p is close-ish

All voltages are nearly spot on.

[Lou Popadoo]

The proper ground point for AC helps...The ACV at point "C" and the Collector of Q4 are the same, 1.7VAC.  When I said the voltages are nearly spot on, that meant the DC voltages.

[shooter]

The ACV at point "C" and the Collector of Q4 are the same

voltage is a secondary issue, frequency is the primary issue, if your oscillator is "syncing" to 60hz, that's a problem, if it's producing 60hz, that's a problem.  You are correct, you need a good, solid DC, for proper AC operation, so we've got that far   

[sluckey]

An easy way to tell if that signal is derived from the power line rather than the oscillator is to set the scope trigger source to Line. If you can then lock the signal display then that signal comes from the power line. If the signal display is unstable or simply drifts slowly rather than being rock solid, it is not synchronous to the line and is probably being generated by the oscillator.

BTW, that's the ugliest trem signal I've ever seen. I would expect to see a very clean sine wave. To produce a useful trem effect, the frequency should be about 3Hz to 10Hz (period .3sec to .1sec). Your 6.2mS (161 Hz) signal is useless for a tremolo effect.

[Lou Popadoo]

With the scope on Line, the signal is a "little" jittery, mostly solid.  My work is per the drawings I have, with the help from this blog.  I will review all again.  Any more insight as to why I have an unusable trem signal, or how I could be getting a signal from my power supply is much appreciated .

[shooter]

did you build your osc on a perf board, or breadboard, If so, try and make it work from an independent power supply.  you can "cheat" things like pots by using a R value ~ 1/2 the pot value.

[sluckey]

Are you focused on making that trem circuit work?

Or are you open to using a different trem circuit that will tie into the signal path like the Standel circuit? If so, look at this simple phase shift oscillator that uses common easy to find parts. I put this into a Fender amp...

     http://sluckeyamps.com/misc/76_Amp_Project.pdf

This circuit uses a home made opto-coupler with a Radio Shack photo cell and tiny incandescent bulb. But, the opto-coupler can be replaced with a Vactrol VTL5C1 simply by changing the series limiting resistor. You could use the VTL5C1 in your circuit too.

[Saransk]

I just picked up A very nice Imperial (S110-VA) which appears to be working very well - needs a new head cabinet - but is complete.
The odd thing is there is no "Black" module in the amp.
No of the various schematics - The Custom/Imperial one or the "S110" one is quite correct
I don't have the -4 VDC circuit either,
The one Orange lead - apparently from the "top" of the LDR goes to the output of the "Blue" module at the volume control
The other Orange lead - right next to the first - goes to the Ground side of the Volume control.
Not sure of the date of this Standel but this looks like it has a "M6" Red module - found on the Custom/Imperial schematics - that doesn't have a "Black: module in the circuit.  At least the wire color codes and hook-up match my Imperial.
I wonder when the "Black" module was added to the Tremolo circuit - maybe it was to make it easier to change a bad Light/LDR when needed - probably a cheaper module.

Mike