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Re: K200A-1 Power Amp Rescue Needed [message #27280 is a reply to message #27270]

Thu, 25 April 2019 10:11

thetragichero is currently offline

thetragichero
Messages: 33
Registered: April 2019

Member

just a little update
took all of the resistors off the PC702 board one by one and tested them out of circuit
here is the list of the resistors i've changed and what they measured at (they are in the order i tested)
r704 5k7
r706 5k4
r709 38k
r703 43k
r715 540r
r730 138r
r729 165r
r715 197r (WOW almost 100% out of tolerance!)
r711 5k1
r710 2k5
r701 5k6
r702 5k4

i had previously changed any other 100r resistors on the board because they seemed to have drifted the most. they must've gotten a good batch of 1k resistors because i haven't had to change a single one

while i was in there i replaced all of the electro caps on the two preamp boards (i figured if it needs to be done eventually, i might as well strike while the iron was hot, so to speak)

fired 'er up and measured voltage across speaker jack. fluctuates rapidly but mostly in the mv to +/- 1v or so range. this is close enough for me to brave testing it later, after the hallway where my music room is accessible (replacing all of the moldy, rotten subfloor from water we took on in the past two hurricanes...)

i would've tested when i finished last night but my better half was asleep and i've made the mistake of abruptly waking her with a loud guitar chord one too many times

i'll report back after testing (might be awhile)

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[Message index]

		K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 19 April 2019 13:28
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sat, 20 April 2019 06:20
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Sat, 20 April 2019 12:59
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Sat, 20 April 2019 15:10
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Sat, 20 April 2019 22:09
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 21 April 2019 06:06
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 02:41
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Mon, 22 April 2019 06:09
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 10:27
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Mon, 22 April 2019 11:27
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Mon, 22 April 2019 12:19
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Mon, 22 April 2019 12:39
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Mon, 22 April 2019 23:47
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Tue, 23 April 2019 06:14
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 10:11
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 12:27
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Thu, 25 April 2019 13:18
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Thu, 25 April 2019 14:10
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 14:17
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Thu, 25 April 2019 14:48
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Thu, 25 April 2019 15:21
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 25 April 2019 16:28
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sat, 27 April 2019 22:20
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sun, 28 April 2019 00:14
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 28 April 2019 06:04
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sun, 28 April 2019 09:34
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Wed, 08 May 2019 00:51
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Wed, 08 May 2019 18:39
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Thu, 09 May 2019 17:31
		Re: K200A-1 Power Amp Rescue Needed By: chicagobill on Fri, 10 May 2019 12:07
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Fri, 10 May 2019 12:17
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Wed, 15 May 2019 12:20
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 16:46
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 19:47
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Fri, 17 May 2019 21:46
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sat, 18 May 2019 05:54
		Re: K200A-1 Power Amp Rescue Needed By: thetragichero on Sat, 18 May 2019 10:40
		Re: K200A-1 Power Amp Rescue Needed By: stevem on Sun, 19 May 2019 05:54
		Re: K200A-1 Power Amp Rescue Needed By: JDinPA17603 on Sun, 19 May 2019 08:37

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