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Re: reverb issue [message #13303 is a reply to message #13234]

Sun, 28 March 2010 10:29

stevem
Messages: 4746
Registered: June 2004
Location: NY

Senior Member

Here are voltages off of my 803 board in a k200.
My 8 volt + power rail tested at 8.06 vdc.
The - rail tested at -7.87
Transistor voltages below
E~~~~~B~~~~~~~~C
Q800 B+.507 C+3.86

Q801 E -7.0B -6.3 C -.103

Q802 E -.554 C+7.4

Q803 E+8.06 B+7.4 C -1.33

Q804 B+.629 C+4

Q805 B+.6 C+4.17

Q806 B -.7

Q807 B -.7
These voltages where with a known good pan hooked up.

I also noticed from working earlyer in the day on a K100 with a reverb problem that when the recovery side of the reverb circuit is working right, you can unplug the cable from the jack that goes to the output side of the pan and just by placing your finger tip near that jack get alot of hum to come out of the speaker(IE good gain level)and good loud pan crash when you plug the cable back in and kick the pan around.
This is quite different from what I had for the reverb problem in the K100.
In that amp if you bang the pan around you got a bit of pan crash, but nothing like when the circuit is working normal.
I also found that even though in the K100 I had some gain in the recovery side, it still was not enough to hear any reverb function out of the speaker.
Your problem may lie in the recovery circuit if you do not get a good strong pan crash, or if you tap the end of the rca cable that plugs into the output side of the pan you should get a very loud buzz out of the speaker, and this is regardless of having any of the reverb controls turned up on any of the channels, as the verb output goes right to the output stage driver board.

I hope this helps out!

[Updated on: Sun, 28 March 2010 10:35]

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[Message index]

		reverb issue By: cassent5150 on Tue, 23 March 2010 08:41
		Re: reverb issue By: chicagobill on Tue, 23 March 2010 14:51
		Re: reverb issue By: cassent5150 on Wed, 24 March 2010 23:28
		Re: reverb issue By: stevem on Tue, 23 March 2010 16:41
		Re: reverb issue By: cassent5150 on Wed, 24 March 2010 22:57
		Re: reverb issue By: stevem on Thu, 25 March 2010 06:33
		Re: reverb issue By: cassent5150 on Thu, 25 March 2010 20:12
		Re: reverb issue By: chicagobill on Thu, 25 March 2010 16:53
		Re: reverb issue By: cassent5150 on Thu, 25 March 2010 18:06
		Re: reverb issue By: chicagobill on Fri, 26 March 2010 12:18
		Re: reverb issue By: cassent5150 on Fri, 26 March 2010 20:20
		Re: reverb issue By: chicagobill on Sat, 27 March 2010 12:01
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:24
		Re: reverb issue By: stevem on Sun, 28 March 2010 10:29
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:30
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 22:19
		Re: reverb issue By: stevem on Sun, 28 March 2010 13:33
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:36
		Re: reverb issue By: stevem on Sun, 28 March 2010 13:45
		Re: reverb issue By: stevem on Mon, 29 March 2010 06:01
		Re: reverb issue By: chicagobill on Mon, 29 March 2010 13:03
		Re: reverb issue By: cassent5150 on Mon, 29 March 2010 21:40
		Re: reverb issue By: stevem on Mon, 29 March 2010 13:08
		Re: reverb issue By: chicagobill on Tue, 30 March 2010 11:28
		Re: reverb issue By: stevem on Tue, 30 March 2010 11:38
		Re: reverb issue By: stevem on Tue, 30 March 2010 12:59

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