Discussion in '"Boat Anchor" & Classic Equipment' started by KE0ZU, Aug 9, 2019.
Find yourself a 4-20 Transmitter and 4-11 modulator.
click the pic
A few weeks ago, I acquired a Heath SB-310 for $35.00. This is the SWL equivalent of the SB-300. It has the Heath modification that eliminated the 11-meter "CB" band and added the 13-meter and 15-meter bands.
It didn't take much to get it restored and working.
I didn't really "need" the receiver. However, it was in an auction and I made a minor bid. No one else outbid me. As such, I acquired the receiver.
That's a great find. I have had mine for around 15-20 years. According to Electric Radio magazine, there were around 800 made.
Very close, but not quite! That spinner shaft on the main tuning knob was something added. The factory knob doesn't have one.
Likewise, the spinner tuning knob shown in my avatar isn't correct either.
I put one of those SB-104 spinner knobs on my SB-102 as well, it's a nice addition.
Couldn't walk past this as a parts radio at a recent hamfest:
The camera doesn't do justice to the yellowing which was a thick layer of tar and nicotine
The case colour was silver underneath the goo. Two applications of scrubbing bubbles on the chassis and case and it is too good to break up, so it has become yet another project!
As to my earlier post, there is a Hammarlund 4-20 and 4-11 modulator in the next Schulman Auction starting on the 31st.
How do the KT-120 dimensions compare to the 6550? I have a CE 100V TX since 1965, which uses a pair at RF and just curious about interchangeability.
The KT120 tubes are a bit Taller 5.125" from the bottom of the Center pin to the top of the tube.
The Data sheet is located HERE
Note: The Heaters also draw a bit more 1.6 Amps for the 6550 and 1.7 - 1.95 amps for the KT120
I just might have to get one to play with. My favorite at that power level/size is the 4D22/4D32 but I have no AB1 or AB2 audio distortion details.
However the filament for the -32 is a substantial 6.3V @ 3.75A for a heck of a lot peak reserve.