Jump to content

Difference between ETA 2783 and 2784


Recommended Posts

Besides the frequency. I have probably  have had to must on my mind. I stuck on that i had a ETA 2783  and found a new balance for that . Installed it and it runs like a dream on the Timegrapher. But not that hands. Why. Until i studied the  frequency. 21600 for the 2783. Them i take a closer look at the movement. It says 2784. that is a 28800  Hz  movement. No wonder it did run slow on the dials and hands. I am not sure what to do now.  What could be the difference between the balance wheel on a 2783 and a 2784. Is the hairspring different? 

Can i do a 2783 off it if i take the escapement from the 2783? 

I now  i should get a new balance but already cut the budget? And 2784 balances are hard to find also? 

Edited by rogart63
Link to comment
Share on other sites

The 2783 balance diameter is larger than that on the 2784, and its listed as having a different balance staff than the 2784 mainsprings are also different with the 2784 having a slightly stronger one at 0.13 as opposed to 0.12 on the 2783 I should also imagine that the hairspring on the 2783 is longer,  and also the wheel train ratios are different between the two.

  • Thanks 1
Link to comment
Share on other sites

9 hours ago, rogart63 said:

I now  i should get a new balance but already cut the budget? And 2784 balances are hard to find also?

Cousins list the 2771 balance complete under the 2784 parts for £9.04 and the staff is the same as the 2784 so should be compatible if you need one.

  • Thanks 1
Link to comment
Share on other sites



×
×
  • Create New...