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Migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Test, please ignore. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Seeburg TSU5 Selection Issue Persists
by Jerold Kress 05 Feb '23

05 Feb '23

Help! I’ve followed everyone’s suggestions on this stubborn problem with my Seeburg TSU5 (in an AY160) but the issue persists. The issue: the mechanism will select any single that happens to be closest no matter what buttons are pressed. Happens during scanning and if resting to the right. What I’ve done: recapped electrolytic & paper/film caps in TSU5 & Pulse Amp. Tested all resistors and changed a few that were out of spec. Replaced 2050, 6X4, both OA2s, Voltages to both sides of R518 and OA2’s are correct. Cleaned RCA to Pulse Amp and reflowed ground wire. (There’s a red wire on the RCA cable that’s not connected to anything on the plug but the green wire is soldered to the RCA center post.) Also ran a ground wire from mechanism to chassis. Originally I had a short on the 6X4 tube socket but I replaced the socket. I recently lubricated the mechanism and assume clutch is not the problem if I can manually trip it to pick up a record. This juke worked great until the 6X4 socket shorted. Any ideas on what to do now greatly appreciated. In the meantime, I will study the manual again. (I apologize if you see this posted twice but I’m posting to both a Facebook group and an email listserve.). Jerold K

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Migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Please ignore. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Server migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Please ignore. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Hello, testing. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Server test
by Jay Hennigan 05 Feb '23

05 Feb '23

Testing migration. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Server migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Please ignore. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Migration test
by Jay Hennigan 05 Feb '23

05 Feb '23

Test 3 -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Test of new server
by Jay Hennigan 05 Feb '23

05 Feb '23

Migration should be complete. Please advise me at jay(a)west.net of any issues. -- Jay Hennigan - jay(a)west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV

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Wurlitzer 532 hum revisited
by Carl Haines 01 Feb '23

01 Feb '23

Many years ago I had asked about a noticeable hum that from my W 532 amp. I checked out a few things but never resolved the hum problem. At the time I was new to tube amps and wasn't quite sure how much if any hum might be normal for these amps and just left it go thinking that some hum might be normal. Now that I have had experience with a couple more tube amps, I realize that the hum is not normal and have decided to dig in and try to resolve the hum problem. Symptom: Hum that does not change with the volume. Sounds like 60hz to me and not sine wave since it has bit of a buzz to it. I've narrowed it down to the circuit for the 6AU6. Hum goes away when the amp is muted. Removing the 6AN8 does not change the hum. Shorting the Aux Amp connection has no effect on the hum. Removing the remote volume plug has no effect on the hum. I did go through all the resistors that did not require flying a lead to verify their values. I did find a few that are marginally out of spec reading approx. 10% too high (R34, R36, R37). Replacements are on order, but I am not convinced these are the culprit, but my plan is to replace them to be sure. I think this is a case where I wish I had an oscilloscope to probe around to see if I can narrow down the source of the hum. I verified all the grounds for this circuit and tried swapping out the tube. My next plan is to go back and check the B+ and then check all the component values and connections for this circuit. Since these are all on the PCB, I can't imagine there being not being connected correctly but who knows. Am I missing anything obvious? Carl Haines

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