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Francois,? you do NOT require the? 2 x? 50K bleeder? resistors. Each of the 8 x 200 uf filter caps already has a 100K resistor across it.? ?2650 vdc / 800k = 3.3 ma The 8 x 100k resistors?

Hello Thanks for the dictionary; it was essential. Fortunately I made a diagram so that you could tell me that it was not the right solution. I now have to translate your text to make a diagram of the

Dentron Clipperton L and Yaesu FL-2100B have no grid current metering, so B- is chassis ground. I just did the hard grounding of grids on my FL-2100B. cathode goes through bias diodes to ground with

You can either float the supply, OR grnd the B+.... OR grnd the B-.? ? If you grnd the B+ to the chassis.... you now have a -5kv supply...which will also kill u.? ?This assumes the safety diodes

You still have it wrong.? ?The 2 x 50K? @ 50 watt? wire wound resistors in the L7PS are removed.? ?The 5K @ 7 watt resistor below the chassis? of the L7PS is also removed. (Originally, Drake

HV =? h

Along the same lines as I mentioned the other day, QRO Technology made a blunder on the HF 2500 amplifier. ?I found this problem when a local ham called me and told me that his HF 2500 would restart

I have drawn a simplified diagram of the L-7 power supply. I have drawn in red an additional bridge to establish to prevent the cathode from being isolated. In emission, the ammeter is shunted by the

Hi fellas Sounds like you guys learned in your hobby what I used to teach my junior electrical engineers. Of course, they all worried about the hot wire. I told them in order of importance, it’s

Hello Your participation is very interesting because I am in the process of putting a Drake L-7 back into service. I understand very well the electrical problem that you mention and the original

Lou can chime in on this one.? On? the..... "big 3"? ? ameritron amps....... they don't use a resistor at all.? On RX it's wide open !? ?I got into an argument with W8JI about this years ago.?

Low mu triodes are useless for GG.? ?Reason is...... they require a stupid high amount of bias V? to obtain normal idle current.? ?You can see that effect asap, by looking at the constant current

Hi Everyone, I thought I might find a bad tube by swapping both tubes in and out one at a time.?? Only thing I confirmed is that what ever the problem is, it hasn't healed itself.?? FWIW I checked

An 'A1' triode is a Low Mu Tube and will NOT work as an amplifier at Radio Frequencies. Like Medium Mu Triodes, designation ending in A3 and A5 also will not work in RF Amplifier service They are used

Well, I picked up the amp and it looks pretty much complete minus the tubes and vacuum variable which I have already found one. I was looking at some of the Russian tubes and found that they have a

Just letting you know, Effective? Nov 2024 ECONCO no longer tests tubes at no charge. The fee is now $150 per tube. thanks to the new corporate owner TransDigm. Reid Re: Need Help with Amp Supply

That helps, I was thinking maybe he meant the plate choke. Thanks [email protected]> wrote:

Plate Blocker is the big capacitor that is connected to the plate tune capacitor coming off the tube anode. Should be 5kv or more rated. Shorts won't always show with a multi meter till they get warm.

Hey Alek, How's 20 meters been down in your neck of the woods lately? Maybe we can get on and say hi again one of these days soon along with your "Jack Daniels" friend! 73 and happy new year, Bob

Hal and all, I've started testing each tube in each socket individually and will post my results hopefully later today.? The first tube doesn't show any shorts with a DMM.? I don't know what a