Tube socket,fan,chimney for GI-46b Heathkit SB-220 Kenwood TL-922 KK4NOZ 3-500z

Description

Offering a collection of parts that will convert the 3-500Z socket mounting holes in Kenwood TL-922 & probably Heathkit SB-220 linear amplifiers.
Heathkits have 36mm chassis to bottom where the Kenwood has only 25mm.
Tubes are properly cooled to better the max spec of 392 degrees F or 200 degrees C for the new tubes.
Tube cooling spec is 24 cubic meters/hour/tube or 15 cubic feet/minute/tube.
Out the 65mm diameter cooler duct size is 440 linear feet/minute or 25.5 cubic meters/hour/tube.
Kenwood stock fan will remove about 414 cubic meters/hour.  Included is hi-temp silicone ring good for 450 degrees F.
Loaded deformation temp of PVC is 200 degrees F.  No PVC deformity has been found so far.
Fan is 12VDC 4 pin.  Full speed with yellow + and black -.  Tachometer output and PWM input options.
Re-tap Kenwood filament transformer from 120v to 100v to bring 10VAC filament supply to over 12.6VAC for Russian tubes.
Fan holes must be drilled larger to accommodate imperfect Kenwood to fan alignment.
Holes punched in bottom for fans are a clean 3".  2.5" might even be better.  I have a hydraulic punch for either size hole.
Search Ebay for KK4NOZ & send yours in for punching.  Heathkits do not need bottom holes for fan intake.
Working great as a beta design so far at 1000-1200 watts PEP.  See https://www.youtube.com/watch?v=3wZWrg61Xk4
Package includes everything in first main picture.
Tube and cooler not included.
Get quantity 2 for dual tube setup.
In case you're interested, many mods are done.  Vacuum output and reed input relays. Modified W7RY bias/softkey/relay boards. LED lights.
Tube warmup plate relay and operate/key lockout during warmup relay.  Timer for warmup delay.  Extra fusing. 160M cap brought to 80M.
Heavier band switch. Safety diodes across meter shunts. Ten ohm ten watt wirewound ceramic resistor in series with plate supply (a must).
These sockets are made from real finger stock and are the best available.
Search Ebay for KK4NOZ for all my amateur radio items.  Thanks for looking.