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5687 tube

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#4
Those, too, are fine tubes. A Russian tube to keep an eye out for is the 6N30/6H30. Look what they use in in the finest tube amps out there, like those by Ken Shindo. Usually that's a pentode. But when triodes are used, it's frequently low Ra triodes.
 
#5
croccodillo said:
I found some Haltron (England) NOS 5687 tubes in a local shop, at a low price: are they good?
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5687's are teriffic tubes. Generally pretty linear, and not real tubey sounding. Plus they have a low plate resistance (~2K) so they can be used in a grounded cathode configuration as a line stage or driver very easily without the need for srpp.


croccodillo said:
the same shop has some russian (no brand) 6N6P/ECC99, what about these tubes?
Click to expand...

Also a teriffic tube. Perhaps a little warmer than the 5687? These you can get on ebay for about $3 per, but are almost the same tube as the above mentioned 6H30. Even lower plate resistance on these.

I use both of these tubes with a plate load CCS as a gain stage for a DAC with passive I/V (http://www.ecp.cc/5687_module.html) and both work very well.
 
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