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Re: K200A-1 Power Amp Rescue Needed [message #27281 is a reply to message #27270]

Thu, 25 April 2019 12:27

thetragichero
Messages: 33
Registered: April 2019

Member

update: i couldn't wait so i tried it out. sounds a bit hissy (who'da thunk with all those carbon comp resistors, right?), output power not nearly what i would've expected (it's not quiet but i expected louder... the 100watt solid state traynor pa i converted to a guitar amp is LOUD)
i will admit that the bias diode is not attached to the clip just yet, because i am waiting on a shipment of thermal grease to come in the next few days, so that could be part of the problem
i am getting 40V on r705 (i want to say it's the end connected to r710 but maybe i was looking at something upside down...) and mv on the other end, whereas the schematic says 60V at the junction of the emitters of q701 and q702
i didn't put the knobs back on so i got some crackling touching the pot shafts. i will clean the pots again

received some 2n3055 in the mail today i may chuck in just for S&Gs once the thermal grease is here. the power transistors tested fine but these were a couple bucks on ebay so no harm no foul (and if all of the power transistors i have are good, then i guess i will have to build an amp Wink

)

okay now back to real work lol

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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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