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Hello Tubenetters!

I'm in need of some assistance. I do not know where to go to figure out the year in which Hirsbrunner made the valve block that was installed on my York-cut CC. The serial number is 099117. Reason why I'm asking is because I'd like to get a PVAK installed in the near future and from what I understand is that the older Hirsbrunner valve blocks had a slightly smaller bore (I may be wrong). Where would I be able to find/acquire this info?

Thank you for your help!

I believe that it would be from the 117th valve set made in 1999 as mine starts with 094 and was made in 1994. Your would have the larger pistons as they began making those 1995 or 1996.

All the best.
Roger

Thank you Mr. Lewis and Mr. S for the great advice! This info helps me out a lot!

I know if I had the proper knowledge/tools I would be more than willing to install a PVAK-like system to my own horns.