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LampizatOr- The Horizon DAC Manual
Here are some GENERAL practical tips for tube rolling:
1. Tube compatibility- many people ask "is the tube X compatible with Y?" and the
answer is of course - it depends. Tubes can have completely different bases but be
compatible by parameters and can be swapped by means of an adaptor. A good
example are ECC40, and 6SN7GT - different bases but very close parameters. Or
ECC88 and 6DJ8. Or 6H8C and 6N1P.
2. Other scenario is when the tubes have same base (say - noval) but they have
different pinouts. So we CAN NOT inter-change the two tube types but we CAN use
an adaptor. Same base type and same pinout DOES NOT MEAN that the tubes are
interchangeable - best example is cc81 and cc82 - same base, same exact pinout
but completely different parameters. Or octal 6SN7 and VT99 - both octal, same
parameters, different pinout.
3. Some tubes can have same base, same pinout and same parameters except the
different heaters. Best example is ECC82 and 12BH7 - the former uses half heating
of the latter. They can be used with a switch or within limited timing or with extra
care, depending on the heater arrangement in our DAC. Another example are
completely different tubes that miraculously are perfectly interchangeable - like
E182CC with 5687.
4. Pentodes used in ourHorizon DAC are yet another can of worms. Most Pentode
tubes have the same base (Octal) and the same pinout (Heaters on 2 and 7, anode
at 3, cathode at 8) The problem is that these tubes have completely different heater
demands. Our DAC is designed to accept ALL KNOWN pentodes from this group.
People keep discovering more and more compatible types every month.
We supply the tubes that are purchased new from reliable sources. They are tested
and matched.
WE DO NOT DEAL WITH NOS TUBES, leaving this fun entirely to YOU.
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