Alternate Tube Types - DYNACO Stereo 80 Owner's Manual

Alternate Tube Types

It is true that vacuum tubes made by different manufactures can actually sound different. The amount and
type of sonic differences can be subtle or fairly obvious to a discerning listener. Also, tube reliability and
longevity often varies according to manufacturer.
Vacuum tube manufacturers are still introducing new versions of older tube designs. These new designs
are commonly labeled with partly or wholly new part numbers. Furthermore, different vacuum tube
manufacturers often use different part numbers for their own versions of "equivalent" tubes. Distributors
sometimes substitute tubes from different manufacturers and/or substitute tubes with alternate part
numbers without informing their customers first.
Some audiophiles feel strongly about which manufacturer and/or particular version of vacuum tube to use
for specific applications. The tubes installed on your new Stereo 80 have been selected to provide the
best sound and long life.
As of this writing, vacuum tubes are still produced by manufacturers in Germany (Siemens), Russia
(Sovtek), Czechoslovakia (Telsa), China (Sino), Yugoslavia (EI), and in England. Your dealer can
recommend U.S. tube distributors, if needed.
Alternate tube part numbers which can be used on the Stereo 80:
Designator
V1, V5
V2, V6
V3, V4, V7, V8
If tube replacement becomes necessary, Dynaco can supply you with new tubes
and/or a list of specifically recommended vacuum tubes for the Stereo 80.
Common Part Numbers
12AT7
6DJ8
EL34
13
Alternate Part Numbers
ECC81
6922, ECC88, 7308
EL34G, 6CA7