Which Amp Chip is in RC-838?

[Lasonic TRC-920]

So, I have a Victor RC-838 that has a bad amp chip. I was wondering if it uses the AN7171K chip? I ended up buying 6 of these chips for another radio and will have spares and was wondering if it will work in this radio.

Any one know?

 

[Alberto]

Hey bro, the amp chip for the RC-838 is an AN7145 M

 

[Lasonic TRC-920]

Hey bro, the amp chip for the RC-838 is an AN7145 M

Thanks Alberto,

I am assuming it uses two of these? They appear to be stereo chips but with the BiPhonic system, does it use two chips to make 4 channel spacial surround?

Under $10 on eBay. Not bad.

I searched and found this data sheet:
http://www.datasheetarchive.com/1--AN+7145+M+circuit+power+amplifier-datasheet.html

 

[Superduper]

Pretty sure it's just 1 chip Chris. Those are dual amp modules. The biphonic feature is delivered using a similar method as wide setting but calibrated differently.... Calibration accomplished by how the L/R channels are mixed and how much time delay in the mixing.

 

[Lasonic TRC-920]

Pretty sure it's just 1 chip Chris. Those are dual amp modules. The biphonic feature is delivered using a similar method as wide setting but calibrated differently.... Calibration accomplished by how the L/R channels are mixed and how much time delay in the mixing.

Excellent, Thanks Norm. I'm going to order 1 chip and then see about doing a swap, see if that fixes my problem. For $10, it's not like it's going to break the bank.

 

[Alberto]

Yes bro, one chip only. I replaced mine, but it didn't fix the problem.

 

[BoomboxLover48]

Hi Chris, Are you sure it is the amp chip?

Mine showed issues with sound quality when I bought it and all were fully cured with a good switch cleaning.
Now it works like new!

The selector switches are hidden inside linked with levers.

 

[Lasonic TRC-920]

Hi Chris, Are you sure it is the amp chip?

Mine showed issues with sound quality when I bought it and all were fully cured with a good switch cleaning.
Now it works like new!

The selector switches are hidden inside linked with levers.

I have gone through the switches with deoxit a few times, but no change at all. I will open it up again and see if I can test the chip output and see if I am getting only one channel and go from there., will post what I find

 

[BoomboxLover48]

Pin numbers to check for ouput measurements... #2 (R channel) and #17 (L channel)

 

[Lasonic TRC-920]

Thanks Bro,

I have ordered this chip, should be here next week and will get to work on it. I will post here what the outcome is.