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Hello, I am restoring a SX-117. A former owner replaced the original transformer by a transformer with a primary voltage of 220 Volt. The secondary voltage of this transformer is much too high. I

*MEA CULPA!!? SORRY!! SORRY!! SORRY!! SORRY!! SORRY!!* As Jacques suggested I had to double check the measuring setup. Nothing strange in there but a leap of imagination on my part: for convenience

(Since this is a diversion from the original topic (SR-500 Tornado), I assigned a new topic.) Thanks, Bob and Walt, Since the SR-160 and SR-150 both use 12DQ6B finals, wouldn't the sockets be the same

Since you are having strange problems I would suggest not trusting rivets to make a good ground connection.? Much better to solder the riveted grounds to the chassis at the tube sockets and the

Hi Emanuele, I do not understand why the measurement of the L3 and C7A values can be good and the combination of the two so wrong. The only thing I do not see correct in your setup is the use of the

For the 160-500 conversion, the correct power supply is the P-500 or the PS-500-AC. The PS-500A-AC does not have the bias adjustment. If you want to use later versions of the PS-500XXXXX then you

Hi All, To wrap up part of this discussion, Walt Cates' repair guide for the SR-160/SR-500, section 9.11, lists the changes needed to convert the SR-160 to an SR-500. Other than some component

*Jacques* , I repost the measuring setup: The RF probe is an active FET probe ( https://www.ebay.it/itm/334454149650?itmmeta=01JMQYZJDRAM0KEYJVF1A8M4WB&hash=item4ddf055212:g:Q3QAAOSwIipZzBvz ) with

Jim Sorry about your fall, but you still take really good pics. R31 must have been a last minute addition, so no terminal block was available. Maybe parasitic resonance? Sent: Saturday, February

Ah, yes....the SR-10 and SR-11.......the 10 cost (if memory serves) about $120 and for another $10 (?) the SR-11 came with a 'pi' function key I have an almost totally intact SR-52 (mag card reader)

Good luck healing up. I have had a couple of much milder falls, they do a lot of damage. I wish I knew any magic about backs, you would be welcome. I have similar problems with lifting and also

Hi Emanuele! It takes me a bit of time to respond to these things... I had a serious fall in January and broke my back in 3 places so I am hobbling around in a back brace and cannot lift anything

Hi Don, Speaking of slide rules… I used one in my first year at the technical school, but the next year, the HP-35 and the TI hand calculators came in (halleluiah !). Just making a

Hi Jacques I also had a similar concern/thought, but since the alignment had indicated too much capacitance, both were in general agreement, so not so much need to ask. I think the original sweeps

Hello Emanuele, One time again, I performed some calculations from your test results below. IF there is no error in the C7A capacitor and L3 sections measurements, your test results constantly shows

Some additional info: disconnecting BS variable condenser doesn't change things significantly. Here are measurements (ANT circuit only): I then disconnected C33 from V1 pin4 and moved the probe to C3

Emanuele, as you seek out more and more long-shot ideas for your original problem set, sometime you might contemplate the probability that an "almost same" C7 somehow managed to get the right S-85

Emanuele the side view of L3, and L6 shows more spacing between coils than the earlier “almost end views” did, and consequently in my mind, the mutual coupling and trimmer tuning interaction

Agree Jacques, I did some poking around as well and found what you described. Thanks,?Tom

Jim, as your measurements look good, can you post detailed pictures of your S-85 ANT and MIX sections? I would like to check the wiring in mine... -- Emanuele