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Old 16th Apr 2023, 5:21 pm   #140
simpsons
Octode
 
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 1,483
Default Re: Heirloom item help please

Hi Frank

Although you had previously said that the tone control is noisy and intermittent and maybe the cause of the new issue, may I suggest that you eliminate any other causes.

Using an insulated screwdriver or similar, switched to gram with the volume control advanced to normal listening level, do the following:

1. Tap the chassis to see if a loose connection is there.

2. If you can easily reach the valves, with a glove on because they will be
hot, wriggle the ECC83 and EL84 valves which are at the front LHS of the
chassis. If this is the source of the problem, remove each valve and clean
the pins with a sharp knife or an emery board. These valves handle audio
from both the radio and gram.

2. Tap the volume control, balance, tone and function (wave-change/gram)
at the user end ie at the front to see if a control is being touchy about
vibration.

3. Turn the volume control back and forth, leave at a high volume
position, turn the balance and then tone controls back and forth to see the
crackling appears. If it does then it's back to switch
cleaner I'm afraid.

Chris
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