Leak Stereo 20 vintage tube amp repair/upgrade, EL84. Surprise issues!!

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Here's a video on assessing, upgrading and repairing a 1958 HH Scott Leak Stereo 20 tube amplifier made in Britain. See Part 2 for hooking it up to a vintage Leak Point One Stereo preamp.
Replaced broken fuse holder.
Replaced junky electrolytic caps with metal foil and ceramic ones.
Bypassed power supply caps with more capacitance.
Replaced Radio Shack junk resistors with low noise ones.
Re-installed missing 8-pin octal socket.
Discovered this is the 230VAC British version of the amp, but it has American 115VAC outlets on the back!! WHAT???
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Опубликовано:

6 окт 2024

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Комментарии : 12

@EddyTeetree 2 года назад

Old British HiFi uses that plug too. My Linn Sondek from 1974 has it. Mother outlet is to power a turntable or radio.

@clivebarrell6448 2 года назад

There's a large resistor in these units that's designed to desolder itself and fall out in the event of overheating. It looks like you have put a large cap over it

@JoyeMusiccom 2 года назад

Hahaha! That sounds like such a British thing to do! I'll have a second look at the schematic and try to understand what the problem was that they were trying to solve with a self-desoldering resistor. Numerous resistors had been replaced already maybe 20-30 years ago, so the previous technician might have already botched it. What specifically were they protecting from overheating?? If the resistor is floating out in mid-air like that, that's FIRE protection!! If it's touching a transformer, that's SHORT protection (and would indicate they didn't trust their transformers). If it's to desolder itself if it overheats itself, that's poorly-chosen resistor RATING (or maybe they only had poorly-performing resistors) and should be mitigated by correctly sizing the resistor and fuse instead. In my eyes, whoever worked on it last botched it big time, because they put a 5-AMP FUSE in where it calls for a 1A slow-blow!! I replaced that with a 1.25A SB. I don't think I mentioned that in the video.

@ralphj4012 2 года назад

Apologies, late to this video and not sure about resistors dropping off but, yes, there appears to be a high wattage, possibly wirewound, resistor (top right at 4:04) and you don't want to surround that with anything.

@JoyeMusiccom 2 года назад

@@ralphj4012 Thanks, I'll check that resistor with my temperature gun. Might move it to a better location for airflow. There aren't any holes in the chassis to let air out the top (but the whole bottom is open).

@EddyTeetree 2 года назад

You MUST keep that resistor at the correct value or risk destroying the transformers.

@BrumAdam Год назад

A nice amplifier! The speaker terminals were originally phenolic with screws, under which the speaker wire was looped. The US style output sockets are odd but were made by McMurdo (a British company) and on this model would have supplied a tuner and another items as required. I have a Leak Tuner (UK model) which has the US two prong plug to fit into this socket. Very confusing 🤨

@michaeljohnbrown6367 5 месяцев назад

Have the same amp needs work on it

@benhargaden995 Год назад

Hi there, could you please advise me, I have a leak 20 but it's quiet and muffled on both channels, any ideas why that could be? Thanks, Ben

@JoyeMusiccom Год назад

In both channels make me think the signal is connected to the wrong input or something. It was not so straightforward to hook it to the right inputs I found. If it's distorted and muffled, it could be the power supply capacitor is shot and the voltage isn't getting as high as it should.