2. amps-preamps
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Parasound JC-1 - Standby during playback?

Recently I installed a 20A DB for my dedicated room with 2 outlets - One outlet goes into a Shunyata Cylcop serving the Parasound JC-1 and the other into another Cyclop for the front electonics.

I noticed that there are occasions when BOTH the Parasound amps will go into standby mode (RED light) for about 1-2 secs before powering on again (BLUE light). During this time, the front end electronics are still functioning.

Since both amps are experiencing the same thing, then it means that this may have something to do with the electricity? Else a problem with the preamp? Again, I must say this does not happen very often but a nice solution will be great indeed!

Thanks for the advice.
shsohis

Showing 4 responses by bpwalsh

bpwalsh
1,207 posts
 
More information on your system (components and line conditioning) could be helpful...

Rather than this being due to voltage sag, I would suspect a bit of DC coming from your preamp is causing the amps to go into protection.

Always power on your front end components before the amplifiers and power down in the reverse order.

Parasound Halo dealer.
bpwalsh
1,207 posts
 
Shsohis, if you're turning on the JC 1s via the 12V trigger rather than manually, it's certainly possible a bit of DC could be coming from the Nagra preamp. The amps should be turned on last and turned off first, and when turning on allow time for the preamp to stabilize before turning on the amps. The turntable power supply should be turned on before or at about the same time as the preamp.

Please let us know how this works out for you.
bpwalsh
1,207 posts
 
Dhl, have you experienced the phenomenon described by Shsohis? I do not use the 12V trigger feature but have seen such behavior due to upstream components which in fact may put one or both amps into protection mode briefly. Your suggestion of adjusting the turn-on delay is a good one.
bpwalsh
1,207 posts
 
Thanks, I was aware of the multiple turn-on delays. Apparently increasing the time delay can largely address the matter of turn-on thumps from upstream components.
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