H&K Triamp MK1 Reverb

[MJN]

Anyone know the reverb tank model code for a H&K Triamp MK1?

[godzilla]

Have you looked at http://www.schematics.ca

[MJN]

Hi. Thanks for the tip - I did not know about this site. But, I do already have the schematics - nowhere does it say the amp has e.g. Accutronics model number xxxxxxxx for a tank. H&K is unresponsive - so here I am...

[52 Bill]

Is the tank missing?

Most Accutronics tanks are stamped with the code number somewhere on the casing.

[MJN]

Long gone. I acquired this amp completely dead and missing various parts. Finally got it to the point where it works and am now addressing the less important issues.

[Slobrain]

Hey MJN,
How does the amp sound? The H&K Triamp was the series that Alex Lifeson used.

[Joey Voltage]

I have the combo version, I will check and see if I can see anything

[52 Bill]

If Joey Voltage can't find a model number, you can reverse engineer the circuit and figure out the code yourself. There are only 5 basic parameters involved and only 3 are important enough to make a big difference.

[MJN]

Thanks to everyone who has tried to help so far. If nobody has access to one of the tanks on this amp to pull the code, then I would certainly be interested in a quick lesson on determining the impedances for a replacement tank. What do I look for in the amps reverb circuits? Schematic of the circuit attached...

[52 Bill]

From the schematic you posted, you can probably use a basic Fender tank. If you go to the Accutronics site, they have all of the basic parameters listed there to figure out the tank you need.

Most important parameters are the size of the tank, number of springs, input and output impeadence, and how it is mounted.

The drive circuit shows an opamp with a transistor output stage, so the tank input will be low. The return circuit is a basic opamp input so the tank output will be high.

This is similar to the basic Fender tube type circuit, so try a tank from a Twin. If this sounds right to your ears, order one with the same input and output specs, but choose the rest of the parameters based upon what your amp needs, large tank-small tank, mounted open side up-mounted-open side down, etc.