[Boatanchors] De-chirping a Globe Chief Deluxe?

[Charlie Cheney]

I'm trying to set up a couple of operating stations for SKN including a 
Globe Chief Deluxe / 75A3. Problem is, the Chief has a noticeable chirp. 
I'm using good FT-243 xtals. Checked the PS and the filter cap seems to 
still have its original value, and I'm using grid block keying as the 
manual recommends.

I realize it's a low-end xmtr but there is a certain charm in 
communicating with a flea market ugly duckling. Said charm does not 
however extend to getting a notice from the FCC due to a bad signal.

Before I give up on it, I thought I would seek advice from this group. 
Did these things chirp right out of the box? Any ideas (general or 
specific) for cleaning it up? I thought about tossing together an 
external oscillator with its own PS and running the Chief in VFO mode 
but that's kind of like cheating. Guess alternatively I could provide 
external power to the 6AG7 (and at the same time back down the plate and 
screen voltages quite a bit). Or replace the 5U4 with diodes and use the 
socket for an OD3?

Any thoughts?

73,

Charlie K1LDZ