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Transistors, nothing more that 40-50C about 110-130 F - if it can burn the fingers within a few seconds of touch - it's way too hot.

Can you possibly burnish off the heat sinks seat roughness and try reseating them?

Heat sink goo can only transfer well when it's not the flowing medium - just a gap filler. (And small tiny gaps at that...)

As far as pots, some instances - the ground "sheet" (foil shield pattern) may not have all the way thru connection to the other side. I've had to take stranded wire and using a single strand - push into and thru hole and solder to make ground work from top to bottom in some places - but this was done due to a crack or flexing caused by car accidents - not sure of corrosion. The pot may have a ground connection but often "ties" a power feed also - from top to bottom - as a pass thru for a heavier current connection to and from the top sheet like a filter cap or a chain.

Your symptoms seem to say that the pots you've replaced are not fully soldered or if they are, the drains off of the lines are not - or, at least not making a good connection to either power or foil so the modulation symptom tells me it's an unbalanced feed or adjustment.

:+> Andy <+:

<blockquote data-quote="Handy Andy" data-source="post: 633575" data-attributes="member: 52309">Transistors, nothing more that 40-50C about 110-130 F - if it can burn the fingers within a few seconds of touch - it&#039;s way too hot.Can you possibly burnish off the heat sinks seat roughness and try reseating them?Heat sink goo can only transfer well when it&#039;s not the flowing medium - just a gap filler. (And small tiny gaps at that...)As far as pots, some instances - the ground &quot;sheet&quot; (foil shield pattern) may not have all the way thru connection to the other side. I&#039;ve had to take stranded wire and using a single strand - push into and thru hole and solder to make ground work from top to bottom in some places - but this was done due to a crack or flexing caused by car accidents - not sure of corrosion. The pot may have a ground connection but often &quot;ties&quot; a power feed also - from top to bottom - as a pass thru for a heavier current connection to and from the top sheet like a filter cap or a chain.Your symptoms seem to say that the pots you&#039;ve replaced are not fully soldered or if they are, the drains off of the lines are not - or, at least not making a good connection to either power or foil so the modulation symptom tells me it&#039;s an unbalanced feed or adjustment.:+&gt; Andy &lt;+:</blockquote>

[QUOTE="Handy Andy, post: 633575, member: 52309"] Transistors, nothing more that 40-50C about 110-130 F - if it can burn the fingers within a few seconds of touch - it's way too hot. Can you possibly burnish off the heat sinks seat roughness and try reseating them? Heat sink goo can only transfer well when it's not the flowing medium - just a gap filler. (And small tiny gaps at that...) As far as pots, some instances - the ground "sheet" (foil shield pattern) may not have all the way thru connection to the other side. I've had to take stranded wire and using a single strand - push into and thru hole and solder to make ground work from top to bottom in some places - but this was done due to a crack or flexing caused by car accidents - not sure of corrosion. The pot may have a ground connection but often "ties" a power feed also - from top to bottom - as a pass thru for a heavier current connection to and from the top sheet like a filter cap or a chain. Your symptoms seem to say that the pots you've replaced are not fully soldered or if they are, the drains off of the lines are not - or, at least not making a good connection to either power or foil so the modulation symptom tells me it's an unbalanced feed or adjustment. :+> Andy <+: [/QUOTE]

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