Sony VFET TA-4650 batch question

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Hi all.

Bought this - got it from another town.

My friend did some basic sound-check testing once this was collected - got sound from both channels.

Im not going to fire it up again till the death diodes (ad possibly the trimmers also) are replaced.

Finally got it home. I note that the 2SJ18's look different - plus they have different batch numbers. One is "J 52" and the other is "JG 25".

How critical is this? Can I assume that as Im getting sound, that things are good?

If there is only one of each type of VFET in each channel for this amp (ie: like this TA-4650) then this may not be an issue?

Yes the heatsink compound is also messy as hell - I will tidy all this up when I do the recon.

Obviously swapping parts nowadays to get the exact same grade will be kind of, impossible.....
 

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