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I would tend to agree. If I am not mistaken,? the SR 500 in good repair and alignment would presumably do somewhere around 250-275W PEP output based on operating it at 500W PEP input. My HT44 with

The comparison of horizontal sweep tubes vs the 6146 should probably include mentioning the fact that the vacuum tube manufacturers did not use CCS/ICAS ratings for nearly all the? sweeps (some

We shouldn't loose sight of the original topic, which was the use of the 6DQ5 in place of the 8236. The 6DQ5 has a plate dissipation of 24 watts and transconductance of 10.5K. The 6DQ6 is 18 watts and

Hi all, As I recall, there was a bit of a "horsepower" (er, Peak Envelope Power - PEP) thing going on during the late 60s and 70s where manufacturers focused on the 'peak' power (PEP) rather than

Hi, Emanuele, I hope that you get as much enjoyment from your S-85 as I do from my S-40B. But Don brings up some interesting thoughts. We might all learn something from all of this. At one point you

Emanuele, you can’t get away with this without doing a post-mortem for the benefit of many many others that might go down your road starting where you started. [Smiley-face here] The coax has

Hello Emanuele, So my intuition was right. Happy to know that all is good with your S-85 now. Case closed ! 73, Jacques, VE2JFE in Montreal MEA CULPA!! SORRY!! SORRY!! SORRY!! SORRY!! SORRY!! As

Hello Wolfgang, From the schematic and the "normal" voltages chart in the SX-117 manual, the primary +B voltage at C117B looks to be 200V. Which means a transformer HV secondary of 280Vct (140-0-140).

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 I

(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 will

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 22,

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