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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 PAS-4 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 PAS-4:

Designator

Common Part Numbers

Alternate Part Numbers

V1, V4

12AX7

ECC83

V2, V3, V5, V6

6DJ8

ECC88, 6922, 7308

If tube replacement becomes necessary, Dynaco can supply you with new

vacuum tubes and/or a list of specifically recommended tubes for the PAS-4.

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Note:

Because it is possible for oxidation to build up on vacuum tube pins, it is a good idea to remove

and clean them with a small (brass bristle) wire brush once a year. At this time it is also recommended

to clean the tube pins with contact cleaner. Contact cleaner leaves a thin coating on the pins which helps

prevent oxidation. The contact cleaner can either be sprayed directly onto the tube pins (don't get any on

the glass part of the tube) or can be sprayed on a clean cloth which is then used to wipe the tube pins.