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volume pot install

i have a dynaco pat3 and i had to change the volume pot.
i installed a 100k alps and everything seams fine but when i turn the volume close to full the volume goes to zero. the previous pot did not cause this to happen.
yes i know why would i ever want to turn the volume up full?
i don't but, this must be a sign that i have done something wrong or the pot is faulty. or should i be using a dif. value?
it is feeding a bryston amp. any suggestions would be appreciated. thanks rick
uncleryk
7 responses Add your response
uncleryk OP
6 posts
 
i have installed a 100k alps, should i be using a 250k?
czarivey
5,946 posts
 
when you turn the volume up full probably the rotor goes outside of the contact of variable resistor making it an open circuit.
it may be due to the manufacturer's defect.
you can still us it if you don't plan to turn the volume all the way up.
uncleryk OP
6 posts
 
thanks for the reply ... one thing i was wondering as well, i have read in a few posts that the original pas3 requires a 250k volume pot to preserve the original phono riaa. i have also read that using a 250k can produce a lighter tone with possibly a bit more air compared to using a 100k, which can tend to sound a little darker. is any of this true?
thanks again
rick
hifiharv
351 posts
 
I don't think 100K is the original value pot. for a PAT 3. Still though, shutting off at full volume looks like a defect and not caused by the wrong value pot. You really should stick with the orig. value to retain the Dynaco's sonic signature. Go to DIY audio's site, or Audiokarma. The people there can probably tell you more than you ever cared to know about this.
czarivey
5,946 posts
 
It's quite tough to find ones that will go for original fittings, but usually collect some junk to find good one and install.
One could be found among vintage Kenwoods, Technics receivers.
Post removed 
uncleryk OP
6 posts
 
thanks for the responses
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