For 6L6 outputs I use the Hammond 1645 transformer with excellent results! Usually sounds better than original. I think it was Jay Hennigan who originally suggested it to me years ago. Good suggestion. Mauro
Sent from my iPhone
On Aug 3, 2023, at 3:43 PM, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
``Thanks Jim, Ill try to contact him. I assume he has a website. Jim On Thursday, August 3, 2023 at 02:44:49 PM EDT, JIM & LAURIE DIRKSEN via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Bickers uses a 30 watt Fender guitar amp output transformer with good results. Mounts underneath out of sight. On Wednesday, August 2, 2023 at 09:01:18 PM EDT, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:
I believe Ive found the problem guys. Looks like a bad output transformer. Ive got shorts to ground almost everywhere on it. Primary and secondary. Anyone have any spares laying around? thanks, Jim
On Monday, July 31, 2023 at 09:53:29 PM EDT, Jay Hennigan via Jukebox-list <jukebox-list@lists.netlojix.com> wrote:On 7/31/23 18:36, Jim McClave via Jukebox-list wrote: Yes Jay, rebuilt amp and tubes checked. The schematic im using just shows the pin 5 to pin 2 ground connection. But since mine is reading 12 meg, I believe I see a connection to the field coil, Wouldnt that cause my indications?
Ground is pin 2. Field coil is between that and pin 3. A shorted field could cause the overload. There's also AC line voltage on the speaker jack between pins 1 and 6 as a form of interlock to prevent powering the high voltage without the speaker plugged in. Between that and the field voltage, that speaker plug is threatening to bite the unwary. Treat it with respect.
With the machine powered off, unplug the speaker. Measure the resistance between pins 2 and 3 of the speaker plug (not the amplifier socket), black and yellow wires. It should be in the vicinity of 6000 ohms or so. If so, the speaker field is good and your overload is elsewhere. If it's substantially below that, you have a shorted field coil.
-- Jay Hennigan - jay@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
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