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The muffin fan on the back is the optional fan. The optional fan adds to the air flow through the tubes and a lot of air movement around the transformer. Jim - KR9U From: [email protected]

Dear Jim, (et al), Nice to see a good suggestion about running RTTY through an amplifier, e.g., TubeMax. I run an Alpha 76A with a coupla 3CPX800A7's with an outboard supply, and the W7RY triode board

Thanks for your reply. My 86 has the blower and a fan on the rear panel. Is there another fan that can be installed? The blower does have ducting to the tubes. Ron - KK7GO Get Outlook for

There’s no problem running RTTY on this amp. If you keep the grid current under 40 ma and the plate current under 875ma, you will still make rated power and the tubes will last forever. If it

I had to do that as well. A little Dremel and a few seconds. Lou does a good job with those replacement meters. Bob W4JFA

Hi Bob, You asked that I let the group know how things went. Lou sent the meter, and a soft key module, and both are installed and working perfectly. And the new meter looks just like the original.

Hi, New to RTTY. Looking to see what I need to know regarding the use of the Alpha 86 and FSK on RTTY at recommended power settings if any. 73 Ron KK7GO

Not bad on the switch. Its worth the money For a tube like this. Input sound standard. Similar to mine but less spacing on caps. Also not band switched but just 14 taps of inductance from an air dux

Type 90 switch is? just under $500.00? ? It's rated at 40 amps @ 20 kv.? ?Scott doubled up on the contacts, and made it into 80 amp switch. I used a triple wafer model 88, and paralleled all 3 x

Here the manually tuned,? tuned input is installed.? Typ a pair of 4? section broadcast caps are used for this application...and has been used several times in the past. (17-540 pf per section, and

Looks great. I like the drives for the caps mounted vertically. Neat idea. How much are those Type 90 switches? I recognize it. I have one inside my outdoor antenna switch. Its stepper driven. I can't

Ceramic Vac tune and load caps? mounted vertically, both with right angle drives below chassis.? ?Between the front panel and sub front panel, they will both feed a sprocket assy, so the actual

Ok, new project started.? 160-15M amp using the 3CX-6000A7. I re-designed the 160m coil, made from 1/4" tubing, so it's shorter, but bigger diameter, so it will fit.? 80-40m coil already made...from

It's typ only 10-15 pf at most, for a cap...from either NC contact to chassis.... to flatten the bypass swr on 10m.? Typ used on a SB-220. Not required on my L4B's...and dunno abt the TL-922. In this

Hear, hear !!

Yes. A silly activity.? Alek. VK6APK

Dear Alek, My thoughts on seeing the word “bypassed” lead me to believe “running barefoot.” Hal Mandel W4HBM

Yes. That was my observation too. Maybe VC2-1 was marginal on 40m and the 47pF was selected so that it provided that little bit of extra capacitance without messing up 10m with too much capacitance.

Thanks Hal. That would be an interesting exercise. I use my nano vna all the time too but I don't think I'll bother in this case, as it seems to work fine with the cap in place. I'll let sleeping dogs

That 47 pf cap basically would add 47pf to the total of the entire value of the load cap. ?Usually load padding is switched in and out rather than hung on there forever. ?That’s a relatively small