Your father has exceptional taste.

I have the same preamplifier. I decided not to modify with different part. This preamplifier was made back to deliver certain tonal characteristic back when it was made with the parts available that period. If anyone changes parts, that particular sound charateristic will be gone for good. I know by upgrading with today's higher quality parts will make the preamp sounds much more sharp, clear, precise and overall better but that's not the original sound the originally creator intended back then. The only part I will consider modifying is upgrading the power supply with better rectifier and 3 cans of electrolytic capacitors for safety reason.

Any change of providing an update to your project? I'd love to see the restoration.

No more updates on the status of this project ?

Why do service guys on KZfaq always talk in slow motion like they're doing Mr. Rogers?

It belonged to your Dad? I wouldn’t sell it. But that’s just me....