Traynor custom 40 low voltages

Guitarist · 12-17-2006, 12:37 AM

I replaced a buldging 450V cap but when the B+ rail hits a couple of 3 pin transistors the volts drop pathetically. Any one have a schematic for this or seen this issue? All tubes are pulled.

Now this is a high school amp but I'm considering bypassing these regulators etc and going simple/old school or giving it to an uber tech.

Thanks, eh.

Tubebass · 12-18-2006, 01:09 AM

You can download the full service package for the YCV-40 from the Yorkville website. You will see that the transistor in the B+ rail is the standby switching.

Bruce · 01-02-2007, 09:34 PM

If this is an very early YCV40 it may be missing a resistor and you will have repeat failure of the cap ! One of those crossed my path once

.

Guitarist · 01-31-2007, 10:14 AM

Well, it working alot better now. I did the Taynor suggested circuit upgrades. High Voltages are back though I suspect it was a bad solder joint on the IRF 830 B+ regulator.

Now the only issue is after playing it for a bit say 5-10 minutes it belches out a loud .HUMMM. I've been testing the pre/loop out and they sound fine. Ever experience that rude honk?

thanks. guitarist

12-17-2006, 12:37 AM	#1
Guitarist Senior Member Join Date: Jul 2006 Posts: 244	Traynor custom 40 low voltages I replaced a buldging 450V cap but when the B+ rail hits a couple of 3 pin transistors the volts drop pathetically. Any one have a schematic for this or seen this issue? All tubes are pulled. Now this is a high school amp but I'm considering bypassing these regulators etc and going simple/old school or giving it to an uber tech. Thanks, eh.

01-02-2007, 09:34 PM	#3
Bruce Junior Member Join Date: Jan 2007 Location: Sand Mtn. Posts: 5	Early YCV40 If this is an very early YCV40 it may be missing a resistor and you will have repeat failure of the cap ! One of those crossed my path once .

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12-18-2006, 01:09 AM	#2
Tubebass Junior Member Join Date: Jun 2006 Location: New Brunswick, Canada Posts: 8	You can download the full service package for the YCV-40 from the Yorkville website. You will see that the transistor in the B+ rail is the standby switching.

01-31-2007, 10:14 AM	#4
Guitarist Senior Member Join Date: Jul 2006 Posts: 244	Well, it working alot better now. I did the Taynor suggested circuit upgrades. High Voltages are back though I suspect it was a bad solder joint on the IRF 830 B+ regulator. Now the only issue is after playing it for a bit say 5-10 minutes it belches out a loud .HUMMM. I've been testing the pre/loop out and they sound fine. Ever experience that rude honk? thanks. guitarist

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