PYE Provost HF25 Amplifiers

The first instinct with rare vintage equipment such as PYE HF25 amplifiers is to leave them as close to original as possible. Unfortunately there were so few remaining original components, rebuilding was the best option. They were powered up to verify working state before dismantling.

Many thanks to Jeff at the audiomods.co.uk/pye1.html website for providing invaluable information required to get started rebuilding the amps. In addition to the schematic, parts list, and component layout on his site, he provided scanned copies of the owners manual pages, and detailed information about the original parts.

(The owners manual and other documents in .pdf format linked below are comprised of scanned originals provided by Jeff.)

PYE HiFi User Manual (13.5 MB - .pdf document)
PYE HF25 Schematic
PYE HF25 Component Location
PYE HF25 Parts List


The images below show the condition of the amps as found.

Amp SN# Ending 323



Amp SN# Ending 150



The turret boards being prepped for populating.



Circuit boards - Work in progress.


PYE HF25 Rebuild Completed - January 2017

As of January 2017, the rewiring and refresh of these PYE HF25 amplifiers is complete. They are fully operational again. The sound is dynamic; detailed, and airy with only 6 hours of use.


Their current configuration and condition as of January 31st, 2017.

Amp SN# Ending 323


Amp SN# Ending 150



PYE HF25, HF-25, Provost, Tube, Valve, KT66, GZ32, 6SL7, 6SN7, Monoblock, Amplifier, Refresh, Rebuild, Service, Schematic, Parts List, Owners Manual.