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Old 23rd April 2015, 08:36 AM   #1
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Default Musical Fidelity B1 Overhaul

Hi to all diyers! I have my old vintage amp that's been with me through my university years and I'd like to give it some new life. A couple of years ago it had a problem with one channel not playing and I gave it to a local technician to fix it (I wasn't at all happy with the results since it's changed the tonality of the amp but more on that later). The problem now is that it makes a loud pop sound heard through the speaker on turn on/off plus there is scratching on the potentiometer. Since I would not like to do again a "blind" repair with an unknown technician, I've decided to fix it with a friend who knows his way around electronics.

I do hope you guide me in a step by step manner on the issues that I'll be facing since my knowledge on electronics is close to null !

The whole project aim is to fix & upgrade it by using "audio grade" components.

Problem 1: Capacitors

There are the following caps inside, all by "TEAPO" :

4x 4700uF 50V LX 105C (I don't know what LX means !)
4x 1000uF 16V
2x 470uF 35V
12x 220uF 16V
6x 10uF 16V

2 of the (4700uF 50V LX 105C) caps seem to have swollen a bit. So I'll be changing all 4 of them.

Having searched for a bit, I haven't found any 4700uF 50V "audio grade" caps with max temp of 105C. Any ideas ?

I'm thinking of replacing the rest of the caps as well with audio grade. Should I ? Any Brand/Series suggestion ?

Thanks a lot in advance !
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Old 23rd April 2015, 11:37 AM   #2
Nisbeth is offline Nisbeth  Denmark
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Most manufacturers will not specify 105 degree caps unless there is a need for it. The "teapo" brand (as far as I know) isn't recognised as specific audio-grade types, so these I would replace with Panasonic TS-HA 105deg. electrolytics or similar types from Nichcon, CDE or another name-brand manufacturer purchased from a reputable source.

If you want to go audio-grade crazy with the smaller caps the Nichicon FW/FG/KZ are good choices (depending on what fits). Alternatively, pick "standard" quality electrolytics with low esr and 105 deg. tolerance like Panasonic FC/FM/FR.

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Old 23rd April 2015, 12:30 PM   #3
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The TEAPO brand was definitely nothing special. It was probably the "el cheapo" brand MF used to use.

Since the price difference is not that great i'd go with the audio series caps.

The Nichicon FW/FG/KZ series are not 105C.

Any other suggestions for the required (4700uF 50V 105C) specs ?

Last edited by MANDEL; 23rd April 2015 at 12:32 PM.
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