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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"

Do you have the optional fan on the TR7? If so there is no limit for all practical purposes. I have been running my TR7s at full output on JT/FT modes for years and they don't even break a sweat. If

Wish you had another pair of 3-500Z tubes to put in. I had that problem with what looked like a new set of Eimac tubes, the red ink was perfect, the guy that sold them to me said he had just used

The power supply has the Harbach mod done and has been working great. Of course when this happens only the .82 fuse resistor blows. I do notice some possible arc points on the cover of the L7 and will

I sent an email to Ron and he replied VERY quickly and indicated he would correct his picture........ I also looked at the (uploaded)? BAMA L-7 manual and it has the colors depicted correctly! It

Will the L7 do this when just in Idle no transmit?? Has the power supply been rebuilt ever? Tim WB8UHZ

Found it! http://www.wb4hfn.com/DRAKE/DrakeManuals/L4B/Manual_L4B.htm http://www.wb4hfn.com/DRAKE/DrakeManuals/L4B/L4B-27.jpg I sent Ron an email informing him of the typo. This has me wondering if

The Drake TR7 has beer great rig for me. I had an old Kantronics KAM XL I wanted to interface with its but decide to go back to the future and something like what was available when the sig was made.

All bands. I like the idea of putting the Tiny SA nearby to see if it "sees" anything else going on. I'm going to print these responses and put them on top of the rig so that I remember them when I

Well thought I had it fixed but again without any notice, large spark and bang.? Lost the .82 in the power supply and I suspect the 47 ohm parasitic resistors in the Amp.? I was using 47 ohm 2 watt

You will get more interest if you list installed options. IF filters, noise blanker, AUX7, fans? 73 -Jim NU0C "Robin K4IDC via groups.io" <RobinK4IDC@...> wrote:

Bob makes a good point. Indeed this was my first thought. However in my experience the 40m oscillation is a sustained event. The fact that the meter spike disappears when the VOX delay is set longer

One owner TR7 station available in Nashville, TN. $1500 for all of it, will ship with insurance at buyer's expense, not interested in trades, serious offers seriously considered. All the items work

Steve, is this action noted on all bands? Or only one, namely 40M? The oscillation on 40M occurs up in the 9- to 10-MHz range so the TX LPF may attenuate the signal sufficiently to not indicate on a

Find out where the meter spike voltage is coming from. If it is from the wattmeter sensor you may have a parasitic oscillation. If it is coming from the 2nd IF/Audio board there may be a timing issue.

Look again. It's there, just easy to miss. "Jim VE7RF via groups.io" <jim.thom@...> wrote: -- 73 -Jim NU0C

Whilst we are in discussions over wattmeter readings and so on, I’ve had a chronic anomaly with my TR7A and its wattmeter in CW mode. When I transmit on CW, upon release of the key, the meter swings

The schematic only depicts one 15 amp breaker, when in fact there are 2 of em.