How to fix Tube Phono Guitar amp Motorboating Precision Electronics S10

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Recently purchased this cool 6BQ5 amp at a radio swap meet. Yes, I planned to repair this amp, however due to unforeseen circumstances, the repair actions were cut short. Unfortunately the cause for the motorboating was due to a damaged output transformer. I may have been slightly taken at the radio sale event, however this amp is related to Western Electric, so I should be able to recover the loss and maybe make a few $$ on the deal after all. I do not plan for this amp to meet its end. It will live on as a fine guitar recording amp. Stay tuned. TD

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15 окт 2024

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Комментарии : 37

@TheGuitologist 6 лет назад

Good series, Terry. I did a vid on this same model. I thought it was odd they only had one preamp tube with that output.

@dennisperusse3837 6 лет назад

The motorboating sounded like something from Monty Python and the Holy Grail with the noise sounding like two coconuts being whacked together. ;)

@budandbean1 6 лет назад

Ha, it sounded exactly like that. Great call! LMAO.

@someonebald2022 5 лет назад

I was going to say it sounded like a horse trotting :)

@radioman4738 6 лет назад

Dont forget about the wine:) It may make the project go a lot more smoother... no harm intended. You have valuable information to share with the world and people like me appreciate it very much. Keep up the good work!

@EmbelekoBand 6 лет назад

Looking forward to the next repair video on this amp. Really looking forward.

@shaunsanders9673 5 лет назад

Good vid! Thanks. I didn't realize a bad OT could cause motorboating.

@bradc32 6 лет назад

I have a couple P.E tube amps they were associated with grommes somewhere along the line. very well built amps

@russellhltn1396 6 лет назад

It looks to me the 62 ohm output is also the 25V, and the 500 ohm is also the 70V. Those numbers both add up to about 10W. I suspect the plugs underneath went to a lead (that's now missing) that selects the proper tap for the speakers. That's why the line from the plugs to that hole.

@terencekaye9948 6 лет назад

Hi Ter.. will be interesting to see if the motor boating persists after the O.T. transformer problem has been repaired... Love your videos..

@brittisaacrossman 6 лет назад

Dang, Terry. I sure hope you didnt give much! Maybe its just a busted lead under a few paper wraps? Either way, I see good prices for those PP OPT for 6bq5's on that auction site fairly regularly. Sorry boutcher luck! Looking forward to the finished product!!

@tolerbearALTII 4 года назад

I have a Precision Electronics S35. It's basically just like this amp. I'm trying to learn how to make it into a Peavey 5150esk guitar amp. Do you have any ideas for me?

@whatsstefon 6 лет назад

Makes a great Valve powered Metronome!!! Looking forward to hearing it once you run your magic over it.

@terencekaye9948 6 лет назад

Forgot to ask,,, What are you using for an Isolation set up to protect your oscilloscope? Thank you.

@spaceman8839 Год назад

My 67 super reverb is “motorboating” at a slightly faster pace than this amp here was. Do I need to take it for repair or can I fix it myself? Also should I not use the amp at all until its fixed?

@jk-mm5to 6 лет назад

Fuse holder corrosion is due to iron/copper electrolysis mediated by atmospheric water content.

@jordanch68 6 лет назад

If you have an old 5v or 9v DC wall wart (one with an actual transformer rather than switch-mode) you can crack it open and use the transformer as an output transformer.