SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

Return to SET Asylum

Message Sort: Post Order or Asylum Reverse Threaded

RE: HELP! rectifier wont turn on

12.244.8.66
Posted on December 12, 2019 at 12:40:11
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 I have a Korneff 45 amplifier clone that was not in use for about 3 years and just brought it accross the country. The amp powers on, and all the tube filaments light up, except the rectifier which is out cold, I have various rectifier tubes and none of them turned on, and I know in my other amplifier they work, so it is not the tubes. I checked the tube socket and there are no missing or loose pin connections as far as I can tell.
So then I imagine there is a cap in the PS that is not passing current to the rectifier? Trying to troubleshoot it myself with limited knowledge of circuit electronics. I am contacting the manufacturer but thought it may be worth running by the asylum and save some time and $$,ANy related experience would be greatly appreciated. Thanks

 

Hide full thread outline!
    ...
RE: HELP! rectifier wont turn on, posted on December 12, 2019 at 16:27:49
GTCharlie
Audiophile

Posts: 983
Location: Philippines
Joined: December 9, 2004
 Hello. 1, do you mean all other tubes are aglow except your rectifier tube? 2, it might be more helpful if you can post what rctifier tube your amp uses. There's a bazillion guys in this forum who can guide pin by pin. And finally, have your Multi tester ready

 

RE: HELP! rectifier wont turn on, posted on December 12, 2019 at 16:43:32
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 YES, THAT IS CORRECT ALL TUBES EXCEPT THE RECTIFIER- THE AMP USES 5AR4 RECTIFIER

 

The glow is from the heater or filament circuit, posted on December 12, 2019 at 20:29:07
Chip647
Audiophile

Posts: 2652
Location: The South
Joined: December 24, 2012
 it is not getting the 5 volts it needs to glow. Could be a bad solder joint on pins 2 and 8. At this point you need a multi-meter and the ability not to electrocute yourself.

 

RE: HELP! rectifier wont turn on, posted on December 12, 2019 at 21:01:03
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 Check the solder connections on pins 2 and 8 of the rectifier tube socket.

If they look good, test for 5 vac on the wires leading to those pins from the power transformer. Do this with the rectifier tube out of the amplifier.

You can also check the resistance between the wires that go to those pins. It should measure very low. Do this with the amplifier unplugged from the wall and with the rectifier tube out of the amplifier.

Tre'


Have Fun and Enjoy the Music
"Still Working the Problem"

 

Any update on this issue?, posted on December 15, 2019 at 10:35:16
Cougar
Audiophile

Posts: 4592
Location: SoCal
Joined: June 25, 2001
 Would be nice to hear back to see what you have found out from the last post/advice given.

 

RE: update, posted on December 15, 2019 at 12:48:38
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001



The solder joints look OK and are rigidly attached to the pins. Pin 2 is 0.8 and pin 8 is also 0.8, the meter set at 200 AC, plugged/power on, no tubes installed.

 

RE: update, posted on December 15, 2019 at 17:00:06
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 "Pin 2 is 0.8 and pin 8 is also 0.8, the meter set at 200 AC, plugged/power on, no tubes installed."

I don't know what that means. You are looking for one reading, not two.

You want to measure from pin 2 to pin 8 and you should have 5vac.

One of your meter probes on pin 2 and the other meter probe on pin 8.


Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: update, posted on December 15, 2019 at 19:40:56
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 I measured the AC between pin 2 & pin 8, and it reads 16.8 (?!)

 

RE: update, posted on December 16, 2019 at 06:34:49
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002



Are the green heater wires (pins 2 and 8) coming from the same power transformer as the red high voltage wires (pins 4 and 6) ?

Wait a minute, I just noticed that the red wires are connected to pin 4 and pin 5 and the filament wires are connected to pin 2 and pin 7. Am I seeing that correctly?

A 5ar4 will never work wired that way. The filaments on a 5ar4 go to pins 2 and 8 and the red wires (the high voltage, or high tension called HT) go to pins 4 and 6.

I will look for a rectifier tube that wires up the way your amp is wired up.

Question, are pins 8, 1 and 2 tied together? If so then that would make sense for a 5y4. On a 5y4 the filaments connect to pins 7 and 8. On a 5y4 pins 1 and 2 don't connect to anything so they could just be using them (pins 1 and 2) as tie points. The problem is, on a 5y4 the plates are pins 3 and 5 so that would not work the way yours is wired. Could someone have messed with the wiring? There is solder on pin 3 (and pin 6) on that tube socket. I wonder why that is?

One more question. You said "I have a Korneff 45 amplifier clone that was not in use for about 3 years", have you ever seen this amplifier work?

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 16, 2019 at 11:46:46
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 I just hear back from the builder and he said it should be a 5Y3. I will try this tonight when I get home from work. Thanks

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 16, 2019 at 12:19:16
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 The 5y3 is different than the 5y4 and also will not work.

The 5y3's plate connections are pins 4 and 6 just like a 5ar4.

The 5y3 filament connections are pins 2 and 8.

The 5y4 filaments are pins 7 and 8 with the plates pins 3 and 5.

Study the data sheets and then compare that to the way your amp is wired.

Tre'


Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 17, 2019 at 21:56:26
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 I tried 2 different 5y3 rectifiers that also work on my Fi X amp.
So yes, there is voltage between 2 and 8. Still nothing gets to the 5y3 tube; stone cold ?

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 18, 2019 at 07:07:46
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 How can there be voltage between 2 and 8?

The green wires are connected to 2 and 7.


Will you please look at your rectifier tube socket again.

Which pins are tied together?

Which pins do the green wires go to?

Which pins do the red wires go to?

I am trying to help you but you are not making it easy.

I never said that your amp is wired for a 5y3. I said that if pins 2, 1 and 8 are tied together then a 5y4 (that is a 4 not a 3) would light up but still not work because your plate wires (the red ones) are wired to pins 4 and 5. The plates on a 5y4 are on pins 3 and 5.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 18, 2019 at 07:32:39
D Mike
Audiophile

Posts: 128
Location: Michigan
Joined: October 24, 2005
 Green filament wires would seem to be common for 6.3 volts and many 6.3 volt rectifiers use pins 2 and 7. Cant see any that apply hi voltage to pins 4 and 5.

Can you measure the ac voltage between pins 2 and 7?

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 18, 2019 at 08:01:57
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002

I agree that green wires indicate 6.3 volts.

He measured 16.8 volts but said that was between pins 2 and 8 but I'm not convinced of anything. It looks to me like pins 2, 1 and 8 are tied together.

Pins 3 and 6 both have solder on them. I wonder why. I think someone has messed with this amplifier.

At this point I think he needs to take the thing to a qualified tech.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 18, 2019 at 11:41:29
D Mike
Audiophile

Posts: 128
Location: Michigan
Joined: October 24, 2005
 6BY5G is a dual damper tube that can be used as a rectifier and had an octal base. High voltage goes to pins 4 and 5. Heaters (6.3 volts) goes to pins 2 and 7. I think pins 1 and 8 get tied together, along with either pin 2 or 7, but I'm not clear on how it's wired.

It's a shot in the dark, but a possible application for this wiring.

 

RE: Yes, you're correct- It should be a 5Y3 rectifier, posted on December 18, 2019 at 12:56:21
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 Good catch. That would do it the way the tube socket appears to be wired.

Heater wires on 2 and 7. Cathodes are 1 and 8. 1, 2 and 8 tied together would work and not cause a problem. The heater (pin 2) doesn't need to be tied to the cathodes but that wouldn't cause a problem.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Yes, mystery solved!, posted on December 18, 2019 at 13:37:44
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 It is a 6yb5 rectifier, I heard back from Oliver the buildder who was very helpful and reposnsive confirming that it should be a 6by5 rectifier. Everything makes sense now, Will fire it up tonight!

 

Cool! (nt), posted on December 18, 2019 at 17:59:32
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 .
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Back in the glow- thank you all!!, posted on December 18, 2019 at 19:47:19
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001



It was the wrong rectifier , simple problem. Some smart inmates saw my erroneous assumption right away. Thank you for your patience and generosity. Sort of a Xmas story in an asylum kind of way....

 

Nice looking amp. (nt), posted on December 22, 2019 at 19:29:58
Tre'
Industry Professional

Posts: 17303
Location: So. Cal.
Joined: February 9, 2002
 .
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Nice looking amp. (nt), posted on December 23, 2019 at 09:34:49
HiFiOd
Audiophile

Posts: 707
Location: Oakland, Califonia
Joined: May 30, 2001
 Thanks it sounds even better than it looks, I am floored by the fact that it drives the Klipsch KG-4.2 better than my Fi 2a3 amp. It sounds amazing- Also would like to give Oliver Sayes (Sonic_Oli) credit for not just building beautiful looking and sounding ams. but the built quality is superb, no issues in nearly 5 years after a coast to coast move!

 

Page processed in 0.034 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]