Seth Thomas A206-011Timing

[Reuven Gruber]

I have a Seth Thomas A206-011which contains a floating balance. This is not a Hermle movement and does not use either of the Hermle floating balance

Does anyone know

..... The BPH for this movement
..... How to adjust the rate of this balance

Thanks in advance
Best regards
Reuven

 

[dickstorer]

Mr. Gruber, My research tells me that it is indeed a Hermle. A 130-020 with 10,800 BPH.
The rate adjuster is on the top of the balance wheel.

 

[shutterbug]

Those are prone to problems with the hollow shaft getting dirty and/or the jewels getting broken. I wouldn't change the rate until you are sure what problems exist. A good test is to test the balance without power. Removing it from the movement is best. Turn it 360° and let go. It should continue to rotate back and forth for a couple of minutes. If it doesn't, it needs to be repaired.

 

[Reuven Gruber]

Mr. Gruber, My research tells me that it is indeed a Hermle. A 130-020 with 10,800 BPH.
The rate adjuster is on the top of the balance wheel.

Thank you for the data, it's exactly what I needed
Where did you get the data? - I couldn't find it in my sources

 

[dickstorer]

Actually not research. I just remembered them from the past. Also, look in the back pages of timesavers, there is a conversion chart.

 

[Willie X]

It's an older one. There isn't much information on pre ~ 1965 Hermle products and very few replacement parts are available.

Also, if the balance passes the test Bugs mentioned in post #3 and properly adjusted, your problem will likely be wear (power loss) within the train. The wear can be easily visible and concentrated in a few places, or it can be slight and almost everywhere from top to bottom. The top to bottom (general wear) can be difficult to repair. Willie X