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Old 22nd January 2013, 05:33 PM   #1501
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only if i`ll take apart the other channel, any other solutions that could verify this?
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Old 22nd January 2013, 05:35 PM   #1502
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you said you had C1 shorted. wouldnt the grid resistor be the part tha was shorted. If that grid resistor is missing, you would have oscillation issues.
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Old 22nd January 2013, 06:04 PM   #1503
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the resistor is in place
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Old 22nd January 2013, 07:16 PM   #1504
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Do you have the bypass cap on the feedback network? It is c5 in this picture. Try increasing that. Beyond that, my only guess is the input Jfets.
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Old 22nd January 2013, 08:00 PM   #1505
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from where can I buy original j74?
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Old 22nd January 2013, 08:03 PM   #1506
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Old 22nd January 2013, 09:07 PM   #1507
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first time bought from ebay j109 they were fakes, after that I bought these...hope they are not fake cause I`ll never ever buy this kind of things from ebay
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Old 22nd January 2013, 09:26 PM   #1508
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Quote:
Originally Posted by buzzforb View Post
Uh Oh. Jacco and his affinity for all things rubber.
Oh, BTw, you are needed on aisle aleph J. Mr ZenMod. Calling Mr Zen Mod.
yes ?
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Old 22nd January 2013, 09:59 PM   #1509
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Any ideas on Mr Schultzsch's problem with oscillation when connecting inputs?
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Old 22nd January 2013, 10:40 PM   #1510
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1.never twist GDS (ECB) wires for any output
2.keep them shortest you can
3.include gate res ditto on gate pin
4.be sure that your parts are genuine ; if you doubt - testing routine out of circ is simple
5.if one channel is working - swapping parts ( take care to label them , to not mix if they're matched ) between channels isn't most insane idea in last 10 years
6.if your head is boiling - leave it for few days ; ride a bike , drink wine , communicate with children or even wife

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File Type: jpg matching.JPG (17.7 KB, 234 views)
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