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Dave, Bullseye, I took the 3 pin socket of the transistor and gave it a squirt of contact cleaner in the socket tubes and then plugged it back on and repeated the unplugging and replugging a few

The one that you found is marked with a HP part number and was made in 1986. If you have an ESR meter, I would be interested in knowing the capacitance, ESR and leakage of the failed part. You might

Thanks Steve. I also have found the Tyco instruction sheets that show the use of the tooling. They also reference the M/A-Com and Omni-Spectra part numbers for the various tools. However, the

Yes, looks like it. They only come in a few sizes and bolt patterns. I found the actual part in the UK on ebay. It is a Mepco/Centralab 0180-0452 as in:

Does this look like the part? https://www.ebay.com/i/362119563587?chn=ps&dispItem=1 The price seems reasonable. Glenn --

No, the bias on Q2 is correct if 120v is good. The 16.8v base voltage reverse biases the b-e junction of Q2 turning it OFF. The 7.27v b-e bias on Q1 HV OSC is problematic. This shoud be no more

Dave, HV OSC Q1 checks out just fine on my transistor tester and the connections to it from the board. Graham

Dennis, Do you mean like a capacitor shorting to ground? C3, C6, C7, C8 or C14 for instance? Graham

OK, so the award goes to Glen to who called it correctly. Though the problem manifested itself as low 12V, the issue was in the -10V supply. This caused a 120Hz pulse in the -5.6V (approx.)

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