EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

jonathan dollimore
  • Male
  • East Sussex
  • United Kingdom
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jonathan dollimore's Discussions

Problem with Philharmonic.

Started this discussion. Last reply by Norman S Braithwaite Feb 19. 13 Replies

I know it’s notoriously difficult to diagnose faults remotely, but I’m a bit stumped and so decided to ask. My philharmonic has developed this problem: essentially, it’s behaving as if it hasn’t got…Continue

Philharmonic with Capehart 16e

Started this discussion. Last reply by jonathan dollimore Feb 5. 7 Replies

I have decided to part with my Philharmonic and Capehart 16E. Both were professionally installed in a custom made cabinet made in London in the late 1930’s. I am in East Sussex, in the UK. I have a…Continue

Philharmonic tapped volume control.

Started this discussion. Last reply by Scott Seickel Sep 18, 2022. 4 Replies

I posted about this a few weeks back, looking for a replacement.I’ve been unsuccessful in finding a replacement, and nor can  see how to fix the original. I’ve dismantled it and can't see any damage…Continue

Caps under Coil shields on Philharmonic?

Started this discussion. Last reply by Norman S Braithwaite Sep 25, 2022. 9 Replies

The McMurdo Silver sets have caps above chassis, under the chrome coil shields. Do the Scott Masterpiece sets have them also, or are all the caps on these sets underneath the chassis? I ask because…Continue

 

jonathan dollimore's Page

Latest Activity

Norman S Braithwaite replied to jonathan dollimore's discussion Problem with Philharmonic.
"The "audio diode" is actually a pair of coils tuned to the IF frequency and providing the audio signal and AGC voltage from the diodes in the 6B8G tube.  The diode(s) are actually in the tube!  The component would have been…"
Feb 19
jonathan dollimore replied to jonathan dollimore's discussion Problem with Philharmonic.
"Can I ask - what exactly is the function of the audio diode? thanks, J"
Feb 19
jonathan dollimore replied to jonathan dollimore's discussion Problem with Philharmonic.
"Thanks Norman and David. The set was restored by or for the previous owner. I’m now trying to address the things that weren’t done then, and your advice helps greatly."
Feb 12
David C. Poland replied to jonathan dollimore's discussion Problem with Philharmonic.
"If you had not recapped the 3 diodes, what about the others out of sight: one inside the big tuning cap cover. Also, the for the pointer non-FM Philharmonics, the left rear between the expander tubes and the pair if 3 rd audios is a rectangular box.…"
Feb 11
Norman S Braithwaite replied to jonathan dollimore's discussion Problem with Philharmonic.
"The resistors were run through holes in the shield to maximize shielding of the diode coil.  There are wax-paper capacitors inside the diode shields.  They need to be replaced.  The resistor that failed most likely did so because a…"
Feb 11
jonathan dollimore replied to jonathan dollimore's discussion Problem with Philharmonic.
"Thank you for your help on this. The set has now gone silent though still lit. I have discovered a burnt out resistor in the audio diode. It’s R9, 1k/1/4 watt. I notice that this resistor, and the other one in the diode (and those in the other…"
Feb 11
Norman S Braithwaite replied to jonathan dollimore's discussion Problem with Philharmonic.
"Simple.  Energy received at the antenna.  Scott receivers will pick up strong signals even when the IF amplifier is well out of alignment but will be noisy and not receive more distant signals well. Norman "
Feb 8
jonathan dollimore replied to jonathan dollimore's discussion Problem with Philharmonic.
"Thanks for your suggestions. I’ve already checked the IF valves and aim to do the others this weekend. Meanwhile, does anyone have an explanation as to why the set works fine with a transmitter, but not the conventional signal? I’d hoped…"
Feb 8
Norman S Braithwaite replied to jonathan dollimore's discussion Problem with Philharmonic.
"Perhaps.  You should check the variable selectivity rotors.  At some point during expansion of the pot metal collars the rotor will come fully loose from the variable selectivity shaft and rotate to a point that gravity dictates rather…"
Feb 7
jonathan dollimore replied to jonathan dollimore's discussion Problem with Philharmonic.
"Hello Norman, the problem is of sudden onset , so probably not an alignment issue?"
Feb 7
Norman S Braithwaite replied to jonathan dollimore's discussion Problem with Philharmonic.
"If voltages are reasonable, the IF alignment is a prime suspect for the symptom you describe.  Has the set been aligned and recently checked?  Are the variable selectivity rotors well secured to the variable selectivity shaft?  Pot…"
Feb 7
Kent King replied to jonathan dollimore's discussion Problem with Philharmonic.
"+1 to Alex' comment, especially the tubes in the front end and AGC circuits. Kent"
Feb 7
Alex R. Whitaker replied to jonathan dollimore's discussion Problem with Philharmonic.
"Have you went through and checked all your tube socket voltages?  That's a good starting point.  "
Feb 7
jonathan dollimore posted a discussion

Problem with Philharmonic.

I know it’s notoriously difficult to diagnose faults remotely, but I’m a bit stumped and so decided to ask. My philharmonic has developed this problem: essentially, it’s behaving as if it hasn’t got a good aerial when in fact it has-  ie poor sensitivity and poor signal to noise ratio. However if I beam a signal to it from an SS tran AMT3000 transmitter, it works very well. Any thoughts?See More
Feb 7
jonathan dollimore replied to jonathan dollimore's discussion Philharmonic with Capehart 16e
"Thank you Troy!"
Feb 5
Troy Taylor replied to jonathan dollimore's discussion Philharmonic with Capehart 16e
Feb 4

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