[Amps] 8877 Question

[Gary Mitchelson - N3JPU]

I have been looking for a good quality 1KW class amp for 6M but so far no
real luck (not interested in using 3-500's on 6 again).

I do have a couple of nice 8877's and a bunch of parts from some Harris
RF-354 HF amps I scrapped but had some questions on suitability of some of
the parts for 50Mhz.

1) All the 6M 8877 amp designs I have seen use the SK2200 tube socket. What
I have from the Harris amps are Johnson 122-247-202 sockets, they have a
full 360 deg silver finger stock Grid Ring. Are there any issues with using
this for 50Mhz?

2) The chimneys from this are made by Harris. They are not like the straight
wall chimneys I have seen on 8877's, these have a 5" opening in the base and
flair down to around the tube (the RF-354 uses a single muffin fan for the
cooling, although they spin it at 11,000RPM !) I plan on using a quiet
squirrel cage type of blower. Any problems with using a chimney of this
design?

3) Lastly the Chimney has built in Plate connection made of silver finger
stock. All the other designs I see use some sort of clamp around the plate.
Any issues using this type of connection over the clamp?

Links below are to some pictures of the socket and chimney.

http://www.mitchelson.org/pages/images/Amp/Socket1.jpg

http://www.mitchelson.org/pages/images/Amp/Socket2.jpg


Gary Mitchelson
N3JPU Montgomery Co. MD  FM19
http://www.mitchelson.org/