hi
can i run the pas-2 without the phono stage tubes placed in (only the line stage tubes are in)
will it cause any damage ?
can i run the pas-2 without the phono stage tubes placed in (only the line stage tubes are in)
will it cause any damage ?
4 posters
pas 2 - phono stage tubes
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ronush- Posts : 1
Join date : 2016-02-13
Bob Latino- Admin
- Posts : 3274
Join date : 2008-11-26
Location : Massachusetts
Yes - you can BUT that filament line may have a slightly higher voltage than normal because it normally has to supply four 12AX7's with current. With only two 12AX7 tubes to power on, the load on that filament line will be lower and the filament voltage will be higher than normal. Whether this will cause a problem, I can't say ? What you might want to do is put two cheapy Chinese 12AX7's on the phono board so that the filament line will still be looking at 4 tubes.
Bob
Bob
peterh- Posts : 1869
Join date : 2012-12-25
Location : gothenburg, sweden
ronush wrote:hi
can i run the pas-2 without the phono stage tubes placed in (only the line stage tubes are in)
will it cause any damage ?
Possibly, the filemannt voltage might be too high. But, test it and
measure the voltage over the remaining tubes. If it's less then 28V it's within
allowed tolerances.
Roy Mottram- Admin
- Posts : 1839
Join date : 2008-11-30
what Bob and Peter said - likely the filament voltage will be much higher than 26vdc, which is 13 volts per tube, and will shorten their life dramatically.
Guest- Guest
another option is to buy our v21 or v22 regulated power supply, it uses a voltage regulator for the DC filament, and even with tubes removed, will not go higher, it will be a steady 24VDC no matter how many tubes are plugged in, as long of course, you do not overload it, which is nigh impossible with using any of the PAS2/3 pcb's and upgrade pcb's, as it is rated at 3A!
Go to www.tubenirvana.net and click on the PAS3 Main Page link.
Go to www.tubenirvana.net and click on the PAS3 Main Page link.