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The complete re-drawn (Orcad) L-4PS schematic is in the 'Files' area of this groups.io ( http://groups.io ) , at

Same place in my L4B and L7 manuals. 73 -Jim NU0C "Ken, WA2LBI via groups.io" <wa2lbi@...> wrote: -- 73 -Jim NU0C

Jim; The second circuit breaker is between the bottom leg of the center-tapped input winding and the screw-terminal... it's drawn at a 45 degree angle. In this copy of the schematic, it's just below

The two circuit breakers are circled in the attached schematic. Ken WA2LBI [email protected]> wrote:

I just noticed that my L7 after for possible parasitic oscillations,, I note that the Load adjustment is only good when setting is about 0. I don't remember but that does not seem correct. I have

I was thinking the other day "I wonder what was actually happening"? This was in the late 70's, a common among DXers and Contesters was a dirt cheap thing to do to make your signal just jump and stand

Still can't find it.? ?And I have 4 x manuals for the 4 x l4b's.? its not on the L4PS? schematic.

Running in the low tap position, that is the tune up position is OK as the operator on the other end will not be able to tell the difference, I used my L7 for years like that, I'm still doing it most

INTERESTED... Give me a a lil time to do some research...how does this compare to the MN2700? same freq range, balun compensation, power capacity, etc. TOM NU2W

Works fine, a 9/10 cosmetically, built like a tank. Asking $250 plus shipping. Photos and video here:

FT8 is pretty hard any any amplifier running at or near maximum ratings.? It would be like running RTTY. I have heard that the failure rate for imported 3-500's? is somewhat higher than the

From what I hear, not necessarily. I was just a little while ago running the same amp with a replacement tube of the same type on 80m FT8 with close to a kilowatt out and it held. However it is not

A.K.A. Rotron SU2C1 part number 028270. https://datasheet.octopart.com/028270/SU2C1-Comair-Rotron-datasheet-75968.pdf Available on eBay new $28.00 each plus shipping.

Isn't 2700V really "middle of the road" anyway? And even then Eimac had typical operation data up to 3500v.....? Are the imported tubes so bad that they can't be run at the original Eimac ratings? I

I use 80mm 12 volt DC fans, which are common case cooling fans used in PC's, on my TR7 and PS7.? The ones I use are rated at 24 cfm and 22 Db noise level. I have a NMB 3115FS-12T-B30, 120 Volt AC fan

I did try my 7610 running about 50 watts into the L7 with a standard keying interface for Icom. It seems to work ok. I get about 500 watts out SSB with the CW position selected. Will try and run it

Can anyone provide a link to one of these sellers? The web searches I did led to an endless maze of very dodgy looking websites. I also see the Rotron website doesn't recognize that part number, so

Well, the manual does say 2600 volts unloaded. So that's pretty close. However, idling the amp for four hours doesn't really tell you much beyond the fact that the tubes don't break down at 2645. The

2645 with my HV meter.

Bob, That 2700 volts is a tad bit on the high side, perhaps. 73, Evan, K9SQG