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Topics - ToadMeister

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A red + and a black - alligator clip connected through a wire lead to another red and black alligator clip.
Basically like micro-booster cables.
Free up hands testing continuity, bypass things, etc.

Sooooper useful.

I don't know where mine came from, I must assume the alligator clip gods sent it to me.
Either that or it was those damn elves that leave their beer cans all over the place here, they're drinking my beer and leaving their (my) cans EVERYWHERE!!!!
You little men can't touch those cans!
Ever since I caught on to them I noticed they left me a can on the floor, a FULL one!
I'd have to assume that because they gave those test leads to me, I'd have to feed them copious quantities of my barley-aide....FOREVER?!?!
I need a beer......

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Amplifier Discussion / Caps Pulling up Skirts
« on: May 10, 2017, 09:11:23 AM »
Oh these axial ladies, always laying on their side.

Do I have a couple hot ones?

I have a few smaller size capacitors in my ~40yr old amp and the problem with them is the lamination, or plastic skirt on them appears to have slid down by a few mm's.
Almost the appearance on one end like puckering up lips, with a raised skirt on the other end.

These caps seem bad, but then again, it's only a tease.

Anyone familiar with this?

4
The Newcomer's Forum / Quick Transistor lesson for Idyuts
« on: May 07, 2017, 08:18:01 PM »
NPN - Arrow ---- Never Points iN    Base is positive
PNP - Arrow ---- Points iN Pal        Base is negative

The arrow indicates old fashioned + to - flow.

Think of a 'BEe' line or 'BE' (Base  Emitter) a charge on the Base (the switch) flows to the Emitter (the BEe line) and then allows a charge path bridge between the emitter and collector.

A photo Resistor is almost the same, but the switch is light, not a charge on the base.

That's all for today, if anyone sees a mistake (Ooooh, I make mistakes alright), or cares to add to this, be my guest.

5
Multimeter sez voltage happens when guitar is plucked when multimeter probes are on the RCA jack, drive side.
Shaking amp produces spring sound through the speaker.

Leads from inductors in reverb tank are re-soldered, and both inductors read ~170 ohms, there is no wire break.

Have the little magnets lost their poles from the speaker magnets up above?
Also tried different positions of the tank, up, down, sideways.

I have hit the wall, I need help.

The amp is an old 1970's Randall Commander 1, the reverb unit model # is 4fb2a1a.

Thanks.

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https://www.ssguitar.com/index.php?topic=4236.0
schematic - Randall Commander 1 (rg 120-115) 1970's

So my tremolo (reverb too) doesn't work.
There is 0 V going to the opto-coupler, something is stopping/resisting/cutting off the power.
I figured maybe the 'mps 6522' transistors, but then I stumbled upon someone in internet land stating that a difference in values from bad caps could make tremolo not work.

Should I just re-cap the tremolo section of the schematic?

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Schematics and Layouts / Randall Commander 1 (rg120-115)
« on: May 05, 2017, 09:43:07 PM »
Searched the net, found a link finally, but it was broke!
So I joined the schematic together with GIMP.
Here it is:

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