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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

I have original fan installed and a Astron power supply. Seems like i will be able to run full power! I love how quiet the FA7 is. Tim Gordish

I have a box full of a 32 CFM version. These are great for a DL1000 but way too loud for anything else. The FA7 is a 20CFM fan (or 19, depending on who you ask) as you say, easy to find. IMO it does

I have two TR7's with their companion PS7 supplies and concur that having fans on both the power supply and the TR7 is the best way to go. Use of the FA7 greatly improves the frequency stability of

Long ago, I can remember fixing an SB-220 that would get a plate-to-grid short, ONLY upon heating up. It would immediately fry the grid RFC. Cool the tube down, no short. Steve Wedge, W1ES/4 Time

I recently had a Chinese 3-500zg flash over in a L7. It wasn't pretty. 73 -Jim NU0C "K6OXN Bob via groups.io" <bobk6oxn@...> wrote:

I have completely scanned the Plate Tune Cap and can find no bent or arcing on the plates. I have my original set of 3-500z and will use them to make sure these 3-500zg are ok. I checked the tubes and

Bob, your exciter is a TR7 on 40M, correct? I wonder if the nasty "40M oscillation" that has been batted around here may be in play at this juncture.? After you get the amp back to an operational

I would say that you want both fans even if you don't run digital modes. The fan on the PS cools the main filter caps which will extend their life. The fan on the radio keeps the internal temperature

The tubes may have been gassy. That can happen if they are babied. You might have been able to recondition them by running them for a while at low voltage with some red in the plates. They need to get

The PA in the TR7 is very conservatively rated and has plenty of headroom. The radio is rated for 100% duty cycle in SSB and CW without a fan. If you have a genuine FA7 you can run 100% duty cycle in

Check the plate tune capacitor for any signs of arcing. Also check you coax and antenna system. A load mismatch can cause unpleasant things. 73 -Jim NU0C "K6OXN Bob via groups.io"