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Old 28th Dec 2016, 9:10 pm   #177
indigo.girl
Retired Dormant Member
 
Join Date: Apr 2016
Location: Loughborough, Leicestershire, UK.
Posts: 754
Default Re: My first valve radio project - Philips 462A

Quote:
Originally Posted by ms660 View Post

You won't see the peak resistance spot you saw earlier if R11 isn't connected across the pots track,

R1 connected in parallel: zero resistance (0)---> peak resistance (270k)---> less than peak resistance (90k).

R1 removed: zero resistance (0)---> 500k resistance---> 1M resistance, no peak at mid travel.

Lawrence.
Ah, so in fact all my measurements are quite normal for this circuit.... so if the pot is OK then why do I only hear audio at the top end? Surely it wasn't designed that way?
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