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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 18th Jul 2019, 7:53 pm   #1
simonbt
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Default Fidelity 4-40

Picked up one of these a while ago for free in really good condition. Thanks to Grahams (radiocruncher) live stream a couple of weeks ago, I stripped it down, got the deck going again after a cleanup, changed the belt on the cassette deck, new stylus and gave it all a good scrub. All working well apart from the right channel is well down and sounds awful. It was like this before and even after cleaning the sliders....still as bad.

Would this be the Amp I am guessing but not totally as the LH channel is fine?

I'm a newbie on the electronics side of things and usually buy old audio which need a good clean and simple fixes. I'd like to finish this off as appreciate it was never going to be hifi standard, it's all in really good nick and doesn't sound at all bad for a Fidelity from the 70s!

Thanks in advance.
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Old 19th Jul 2019, 6:35 am   #2
Edward Huggins
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Default Re: Fidelity 4-40

If the RH Channel is poor on all inputs then it is highly likely to be a fault in the RH channel amplifier section. It could be the power rail to it, a poor connection or the Chip itself. Can you use a mulii-meter and take voltage readings?
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Old 19th Jul 2019, 11:20 pm   #3
simonbt
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Default Re: Fidelity 4-40

Thanks Edward - I hadn't thought of they (novice) I'll see what I can see what I am looking for and give it a go.
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Old 20th Jul 2019, 8:19 am   #4
Big jim
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Default Re: Fidelity 4-40

Hi I worked for a fidelity dealer in the 80s and I have to say the system 4/40 5/50 6/60 were the best units and well worth repairing I have the manuals if you need it.all the best jim
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Old 21st Jul 2019, 1:53 pm   #5
simonbt
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Default Re: Fidelity 4-40

I'd be grateful for that Big Jim - PDF I presume?

That would be really handy and I'll certainly be repairing it. Only other thing I have noticed is one of the lamps (tuning) is dim so I'll be looking to replace that.
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Old 22nd Jul 2019, 9:47 am   #6
Big jim
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Default Re: Fidelity 4-40

Ok no problem I will try this afternoon to upload it. Jim
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Old 22nd Jul 2019, 5:14 pm   #7
simonbt
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Default Re: Fidelity 4-40

Thanks Jim
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Old 3rd Aug 2019, 12:16 pm   #8
Big jim
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Default Re: Fidelity 4-40

sorry for the delay. part 1
Attached Files
File Type: pdf Scan.pdf (358.7 KB, 176 views)
File Type: pdf Scan 2.pdf (1.06 MB, 222 views)
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Old 4th Aug 2019, 12:33 am   #9
simonbt
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Default Re: Fidelity 4-40

No problem Jim - I am very grateful. I'll see if I can make head nor tail of the these
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Old 4th Aug 2019, 6:36 am   #10
crackle
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Default Re: Fidelity 4-40

The service information for this music centre is in R&TVS 1980-81 p498. I can scan it for you when I return from Punnetts Town radio meet later today, or tomorrow.

Mike

Last edited by crackle; 4th Aug 2019 at 6:48 am.
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Old 5th Aug 2019, 4:53 am   #11
Big jim
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Default Re: Fidelity 4-40

more to follow it's a big manual
Attached Files
File Type: pdf Scan4.40.pdf (1.17 MB, 131 views)
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Old 5th Aug 2019, 5:05 am   #12
Big jim
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Default Re: Fidelity 4-40

part 3
Attached Files
File Type: pdf 2.pdf (1.22 MB, 125 views)
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Old 31st Aug 2019, 5:31 pm   #13
bikelectro
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Default Re: Fidelity 4-40

As Jim mentioned the System 660, there’s one online auction now, I’d go for it but it is pick up SE England. I remember lusting after this in about 1980!
ADC direct drive deck, Shure cartridge FM presets and 35 WPC RMS and so stylish.
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