Hammond-labeled tubes - mfr?

[6267]

Old hammonds are mostly RCA & GE.
Newer hammonds (that I've seen) are often mullard/eindhoven phillips/valvo?/GE 12ax7s.
Hammond often had service plans including tube replacement, so what we get might not be what they were shipped with.

[RichardBM]

Old hammonds are mostly RCA & GE.
Newer hammonds (that I've seen) are often mullard/eindhoven phillips/valvo?/GE 12ax7s.
Hammond often had service plans including tube replacement, so what we get might not be what they were shipped with.

My Hammond GZ34 is a Mullard.

[Gtr_tech]

Thanks, guys -

I had a 5u4 lying around, and it works!

Just gotta get the oil into all the places it's supposed to go and I'm good (so far).

Mixing naptha with the Hammond oil (yes, use *real Hammond oil*, nothing else will work) is a good trick for cleaning up the oil wicks. The naptha will loosen up the gunk that is in the wicks and allow new oil to get to where it needs to be.

You can go about 50/50 mix. It'll still take a while....have patience.