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Semiconductor: JRC45600 (JRC 45600) – IC PHILIPS AS9300-40…
Last edited by diblet; at I would have to analyze the whole schematic which can take some time but as ANT Alex is fond of pointing out there are muting transistors that can give this kind of problem and you can detect this by unsoldering the leg that is attached to the audio and try again.
If it solves the problem either put a new transistor in or figure a in line dip 456600 solution which will improve on the design as many have said. The Q or in case the right channel Q is probably a good guess.
Last edited by Skywavebe; at Find all posts by Skywavebe. Originally Posted by Skywavebe. Taking it out often times allows some kind of noise as the unit turns on due to circuit instabilities. Alex usually says to get those transistors out as they are more trouble audio wise than they are worth.
I don’t think he has addressed the deck in particular but the circuits might have been plug in from other models and have the same negative issues. If you take a DVM with diode test and check that transistor against a good one you should see some damage noticed in it’s readings. It is likely that it is partially shorted from Collector to Emitter where normal good transistor should read open. I think Alex has had some 456000 placing a diode in the base circuit to make the use of this design more correct.
Semiconductor: JRC (JRC ) – IC PHILIPS AS
He will have to give the details- I am just going by memory on this. Alex ANT is an excellent person to listen to with regard to modifications as he is the only one to date that gives the reason and result of the mods he has figured out. To me his word is gospel. More people that come up with mods should have his methodology. It is the correct way to do things. There could be a problem elsewhere but if the other channel is not affected then probably not.
This kind of failure just has been seen in the past on different decks so that is what comes to mind in a partially distorted situation like this. You can leave it out if the turn on noise does jrd bother you. Originally Posted by diblet.
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For subjects related to tape itself, see the Cassette Tape subforum under this one. Obscure service subjects that don’t quite fit go in the Help and Do It Yourself subforum. Find all posts by diblet. Skywavebe Skywave Tape Deck Repair. Originally Posted 4560 Skywavebe Q is probably a good guess. Originally Posted by Skywavebe You can leave it out if the turn on noise does not bother you.
Originally Posted by diblet i like the sound of that! For more Tapeheads affiliates and links, see jrd Links and Resources page.
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