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Leslie 147 Relay

 

Sirs,
A gentleman came to me needing to have a 147 amp repaired as it is making a huge pop when switching speeds. I will begin by replacing the two blocking caps wired to the motor outlets on the amp,along with a third cap wired across the octal plug and hopefully this will cure it. As I was checking the other components I noticed one set of points on the relay are very worn and pitted badly so I suggested this ahould also be replaced,which he agreed to. My go-to is always TWGH but I find no listing other than the solid state conversion. Are these original style relays all used up, and if so would I be wise to use the box type relay offered by Antique Electronics (Tubes and More)? I would rather not use the solid state unit having installed them on two seperate occasions a few years ago and both failed within a year,so I have little faith in them and prefer original style parts wherever possible.
Thank you in advance,
?John
 

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Depending which country you live in, you will either need a standard 115v coil relay or 230v coil relay, with contacts rated for the purpose of running the motors in that type of Leslie. If you are determined to stick with a coil type relay, I recommend you just buy a new one of the correct type from your usual electronics supplier and fit it under the chassis.?

There are plenty of techs out there will have good used 115vac P&B open coil relays if you have a preference for ¡®originality¡¯ in this application, including me (I have a dozen or more but I¡¯m in Australia and I suspect you¡¯re not).?

However, I consider there's absolutely no reason to go looking for the original type and brand (not manufactured for many years now), and brand new modern coil relays are reliable.?

There are additional strategies to reduce the ¡®pop¡¯ associated with 147 switching if you find it still pops after replacing the relay. Solid state relays don¡¯t solve the pop issue in some cases either, it¡¯s about managing the switching transient into the inductive load (into the motors).

On 11 Nov 2022, at 1:59 pm, john alluneedtoknow via <keysnleslie122@...> wrote:

Sirs,
A gentleman came to me needing to have a 147 amp repaired as it is making a huge pop when switching speeds. I will begin by replacing the two blocking caps wired to the motor outlets on the amp,along with a third cap wired across the octal plug and hopefully this will cure it. As I was checking the other components I noticed one set of points on the relay are very worn and pitted badly so I suggested this ahould also be replaced,which he agreed to. My go-to is always TWGH but I find no listing other than the solid state conversion. Are these original style relays all used up, and if so would I be wise to use the box type relay offered by Antique Electronics (Tubes and More)? I would rather not use the solid state unit having installed them on two seperate occasions a few years ago and both failed within a year,so I have little faith in them and prefer original style parts wherever possible.
Thank you in advance,
?John

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