Repairing a second Tango 211 Japanese amp

SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

Hi all,

I acquired an amp similar to the one I already have (see thread: http://www.audioasylum.com/cgi/vt.mpl?f=set&m=74593). Whereas the one I have was well made and needed just some minor tune-up, this amp needs a lot more work. Almost all capacitors are leaking, and some of the metal-film resistors have disintegrated (see attached image). I also think the diodes are no longer working. Before starting the repair, I hope you can help me answer these questions:

— What event could have caused this massive fail inside the amp? I know the owner was using a 12BZ7 instead of the spec'ed 12AX7 tube, but not sure if that could have caused such a disaster.

— Resistors: Should I replace all low-watt metal film resistors, or just the ones that are visibly damaged? Also in the image, you can also see a red resistor. This and ones like it are high-watt resistors. What type are they? Do you think these need replacing too? (They look/measure OK, and that would add a lot of work).

— Capacitors: Due to the circuit layout, I am mostly restricted to using axial capacitors, which leaves me with Nichicon VX for the aluminum ones. Are these sufficiently good? Do you have other suggestions for the aluminum caps?

— Diodes: The circuit sheet specifies ERC16-12 diodes. I found the spec sheet (attached). It’s in Japanese, but the important specs are clear. Would these Vishay avalanche diodes be a good replacement? I am concerned about the difference in forward current vs forward voltage between the two, but I don’t know enough to tell if this is an issue. Are there better diodes to use?

Note that the circuit schematic is in the thread referenced above.

Thanks!

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Parts Connexion

Topic - Repairing a second Tango 211 Japanese amp - batriq 15:52:20 03/17/14 (7)

It must be something in the air that causes these amp builders - Michael Samra 12:44:37 03/19/14 (0)

RE: Repairing a second Tango 211 Japanese amp - Paul Joppa 19:06:38 03/18/14 (1)

RE: Repairing a second Tango 211 Japanese amp - batriq 19:30:06 03/19/14 (0)

" What event could have caused this massive fail inside the amp?" A butcher. - Chip647 11:34:50 03/18/14 (2)

RE: " What event could have caused this massive fail inside the amp?" A butcher. - batriq 11:43:49 03/18/14 (1)

RE: " What event could have caused this massive fail inside the amp?" A butcher. - elektron 12:16:58 03/18/14 (0)

RE: Repairing a second Tango 211 Japanese amp - batriq 10:44:57 03/18/14 (0)

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