jasonburne71+
magister+
I recommend Echo Audio, Portland Or, and Hawthorne, Seattle. Both sell used and new and repair as well.
Echo has upgraded power caps and signal path caps in a Pioneer SA9500II (a part of one of three systems I use regularly). Echo has also recapped an Accuphase E202 and a Macintosh 6100. All integrated amps 40-50 years old and all extremely reliable and sound-worthy.
I currently run the three systems through ADS 910's, purchased from Hawthorne as well as ADS 710's and Klispch Forte II's. The ADS models are 40-45 years old, the Klipsch Fortes slightly younger.
So vintage gear has been good to me and I highly recommend that path.
These are all my "keepers" after auditioning many of the other noteworthy Amos of the era. They were reconditioned when I decided to keep them and have given me only pleasure and no expense since.
I also agree with the NAD recommendation, particularly the PE Power Envelope models.
Nostalgic? Yes. Quality sound that meets my expectations at a relatively low cost.