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Glen, it could be a bad cap on the -10V as the voltage is lower than it should be and of all the caps, that is where I see 4.6V of AC. I'm going to take it out and bridge in a cap that I have in that

Graham, By chance did you check the secondary is not being loaded down by a bad component? That would likely stall the oscillator. Dennis --------------------------------------------

Yes, you are correct, it is the HV Osc Q1, I was mixed with another section that was giving problems but resolved. I'll pull it out and test it, I have already done that HV Disable Q1 and Q2.

Sorry abpit the NTE214; I must have mixed up the number.? But the info is online. Bob

Electrically equivalent mechanically no, the 1853-0063 is a TO3 device not a TO66 George G6HIG ________________________________________ Sent: 21 October 2017 20:22:48 To:

Hi Ken Please read my posting, I said PNP2N3055, yes their is such a device and it is PNP. It was produced as a compliment to the 2N3055. 73 George

So the filtered feed to the 12V comes off the cap that also feeds the 20V supply. I have around 30V coming off that cap into the 12V regulator. The output of the 12V regulator is only 9.5V. So I

A-1853-0063-1 NTE Equvilent NTE218 TRANSISTOR PNP SILICON 90V IC=4A TO-66 CASE All I did was GOOGLE and that's what it shows as equivalent. Dennis --------------------------------------------

Dan, I have a nearly complete T-200/500 that I got a couple of years ago. It's on a shelf around here somewhere. At the time I did a bunch of searching and discovered the TE-Connectivity replacement

Yes, I spoke too quickly about replacing the A17. The regulator is off board on what I think is called the A23. I'm trying to find the filter cap for the input to that regulator now but the

Check the power supplies and replace the bad filter capacitors. Glenn -- ----------------------------------------------------------------------- Glenn Little ETCS(SS) USN Ret, ARRL Technical

Greetings, Of course, the world is filled with things I don’t know - but I think the 2N3055 is an NPN transistor. I believe its PNP complement is Mj2955. Don’t just take my word, I may be wrong

Hi Manuel The transistor is a low spec Si PNP, try 2N2955 or even a PNP2N3055. Spec is Si PNP,55V, 5A, FT 3MHZ in a TO3 case. 73 George G6HIG ________________________________________ Sent: 21

Hi, this looks like a power supply problem ;-) I would invest a few hours on searching for the problem. If it is in the power supply, it is likely that you can fix it relatively easy. I would guess a

Changing the board won't help unless the raw supply filter cap for that supply happens to be on it. You likely just need to find and replace the cap and it should be good to go. I believe the cap is

By "Q3", do you mean "HV OSC Q1", the off board power transistor connected to T1-3? The 7.27v base-emitter voltage would indicate either a bad connection to "HV OSC Q1" (open emitter?) or a blown

I opened up my 8566B and found that the +12v on the A17 board to be reading 9.5V with 4.5 of AC ripple. The fuses on this board are ok. No burning ext. Should I just find a used board? Is

I looked up an NTE214 and it’s an NPN.

I found several cross references.? I think NTE214 for instance.? It's a TO-3 PNP 3 MHz t5A 80V unit and there are many that can probably work in that slot.? I may have a few in my junkbox.? You

On my 8566B, I found that I have little or no output from the 100Mhz cal signal as well. I haven't lifted the unit out of the rack yet, but to be clear, I have a blinking PL1 Unlock, PL2 Unlock and