Turntable volume low compared to radio. Preamp trouble?

[tonyg88]

ya, its typical for all turntables, even his son's lol.

so, again I ask "the OP" the above questions.

It is true on my Fisher 800c anyways. Especially these new releases on vinyl where they lower the volume so low in order to fit all the tracks onto one record. If so I'd try something released from the 70-80s to see if things improved.

My britney spears - oops I did it again 20th annervisery which was only released this month, volume is so low that I have to turn it up so high it makes it hard to play on my changer because the slight rumble from the motor overpowers it...(where other records are fine) But no rumble on my high end record player.

 

[Grenadeslio]

it's also possible the radio station you typically listen to has boosted it's signal.

 

[tonyg88]

it's also possible the radio station you typically listen to has boosted it's signal.

I also usually find the Radio natural volume is usually louder than any aux/cd/iphones you'd plug into it. On my receivers.

 

[thornev]

Just want to say I used DeOxit on a 70's Sony table top AM-FM. Works like bran new!! Great stuff. Kinda oily but works. Thanks again!

Yeah, I bought a guitar amp whose 14 pots, when turned, made major pops, squeals and scratchy noises. Soaked them with Faderlube and now I have a quiet set of knobs and a great amp.

 

[yaztron]

I'm going to start with replacing the 5 electrolytic caps and R01,02 11&12. What is the wattage and the composition of the resistors?

 

[larryderouin]

Most likely 1/4W Composition originally (Unless otherwise noted on schematic or board diagrams). Use Metal Film resistors, 1/4W, 5% tolerance.

 

[yaztron]

You'll probably end up rebuilding the Pre-Amp. But 1st double check the wiring from the Phono RCA Jacks to the Preamp board. Pins 4A and 4D. Check R01, 02, 11, & 12. Lift one leg and check out of circuit. Replace if more than 5% out of tolerance.

As it has IC's, just replace the 5 electrolytics. Good bet they are dried out and not working. 4 x 10uf 50V UKL series Nichicon, and 1 47uf 63V UPW or UHE caps.

Part #'s and prices are Mouser as of this post.

10uf 50V UKL 647-UKL1H100KDDANA ($0.43ea) x4
47uf 63V UPW 647-UPW1J470MPD1TD ($0.45ea)x1 (Note: According to the manual, this cap is on the solder side of the board.)

Shipping is gonna be more than the parts. So count up the 2sc458 transistors and replace them with KSC1845FTA. They get noisy with Age. Not a case of If, but WHEN! pre-emptive strike is best for these.

512-KSC1845FTA ($0.28ea price goes down at quantity of 10 to $0.21 IIRC) 4 on the Control Amp, 7 on the Multiplex (not recommended to change unless you can align the MPX). Also 3 on the AM/FM IF Meter board (again don't mess with). The 1845 legs are oriented LEFT TO RIGHT, Flat facing you legs DOWN as E-C-B. the 2sc458 is B-C-E. Exact opposite.

I'm ordering parts this week and I have a question.
R01 and 02 look like a 2 watt metal oxide? R11 and 12 look like carbon 2 watt?

 

[larryderouin]

1/2 watt. All of them. You can use Carbon Film or Metal film (lower noise).

 

[MileRR]

@ yaztron: A question, after 4 years: Did you solve the "quiet phono input" problem with your Fisher 201, and how? I have the same problem here. The unit is fully recapped and otherwise works beautifully, except for the phono preamp which is both quiet and dull.

 

[whoaru99]

after 4 years:

yaztron hasn't been "seen" on this site since 2021. You might get a reply but doubtful.

 

[MileRR]

Thak you. My guess is that it phono preamp is set for crystal cartrigde and that it needs another pair of capacitors between pin 3 and 4 of the op-amp. It has the empty slots with the mark "capacitor" (on the printed board) but I can't guess what the values might be. It could be something else entirely.