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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: LA4505 Amplifier IC
PostPosted: 31 Dec 2011, 17:31 

Joined: 28 Dec 2010, 22:07
Posts: 311
Hi all,

I think I need a LA4505 stereo IC. I looked on eBay and there are only a couple for sale for $20. Mouser sells an NTE1675 which is a replacement IC for $10. I am wondering if anyone knows where I can get one for cheaper.

I got a stereo boom box/tape deck from a thrift store the other day. One channel is weaker than the other and I have already confirmed that the speakers are not the problem. I don't have a confirmation yet but I think it's my output stage IC. It could be an opened bypass cap in a transistor amplifier or something else so I need to do some signal tracing. Sadly I have no schematic so I will be going in blind, scanning for transistor faults.

The model is Fisher PH463 if anyone knows how to find the manual download. I'm not interested in paying for it but if it's out there I'd like to get ahold of it. I'm certain that the LA4505 is not being manufactured anymore so I'm hoping the faulty component is a run of the mill BJT somewhere. :xfingers:



You can't have too much heat sink.

 Post subject: Re: LA4505 Amplifier IC
PostPosted: 31 Dec 2011, 22:46 

Joined: 16 Nov 2010, 08:59
Posts: 5
Looks like the LA4505 is long since out of production, and if the stock of NTE1675 at parts houses is any indication it's heading the same direction. I'm not seeing an electronic version of the schematics or service manual for your model either, in fact I can't find any Fisher boombox manuals other that people selling original copies.

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