Crate BV300H schematic??

scustom · 03-17-2009, 07:18 PM

Any one, Bueller...Bueller?

Thanks a bunch in advance.

JustRob · 03-20-2009, 07:42 PM

What is the serial number? There are different models.

scustom · 03-21-2009, 05:00 PM

SN: BWVDO9000X

Power Tube Brd:

V6 4/25/02
06a110-01

Preamp Brd:

06a109-01

My Problem is with the +10 V supply for all of the switching circuitry, LED power, etc. We were sitting at +4, there was a bad Zener just off the rectifier, replaced it and now we're sitting at +15.

While I'm sure that there are different assemblies, the schematic for any one of them would probably get me close enough to troubleshoot this down.

Thanks for helping.

JustRob · 03-21-2009, 07:22 PM

I figured I'd give the correct schematics if possible. Looks like +15 for switching is correct. What other symptoms are you experiencing?

scustom · 03-22-2009, 02:37 AM

Thank a bunch.

I was basing my +10V on what the BV60 uses, and I have dead on -10V. Now that I know that -10v should be -15v I can troubleshoot that further also. Other symptoms are no sound, no LEDs, but other than that, everything is normal. Heaters are fine, HV is fine. Obviously, I knew that there was an issue with the vactrols but since I had no schematic, I was kind of limited to the normal tube amp checks and then tracing the switching circuit as best I could.

I'll give it a look with the schematic tomorrow and report what I find.

Thanks again.

03-17-2009, 07:18 PM	#1
scustom Junior Member Join Date: Feb 2009 Location: Baltimore, Maryland Posts: 4	Crate BV300H schematic?? Any one, Bueller...Bueller? Thanks a bunch in advance.

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03-20-2009, 07:42 PM	#2
JustRob Junior Member Join Date: Mar 2009 Posts: 18	What is the serial number? There are different models.

03-21-2009, 05:00 PM	#3
scustom Junior Member Join Date: Feb 2009 Location: Baltimore, Maryland Posts: 4	SN: BWVDO9000X Power Tube Brd: V6 4/25/02 06a110-01 Preamp Brd: 06a109-01 My Problem is with the +10 V supply for all of the switching circuitry, LED power, etc. We were sitting at +4, there was a bad Zener just off the rectifier, replaced it and now we're sitting at +15. While I'm sure that there are different assemblies, the schematic for any one of them would probably get me close enough to troubleshoot this down. Thanks for helping.

03-22-2009, 02:37 AM	#5
scustom Junior Member Join Date: Feb 2009 Location: Baltimore, Maryland Posts: 4	Thank a bunch. I was basing my +10V on what the BV60 uses, and I have dead on -10V. Now that I know that -10v should be -15v I can troubleshoot that further also. Other symptoms are no sound, no LEDs, but other than that, everything is normal. Heaters are fine, HV is fine. Obviously, I knew that there was an issue with the vactrols but since I had no schematic, I was kind of limited to the normal tube amp checks and then tracing the switching circuit as best I could. I'll give it a look with the schematic tomorrow and report what I find. Thanks again.

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