Today I received a new Heyboer Dynaco 470, NTS-8093 (their part number for it) that is intended as a replacement for a Dynaco A470 output transformer. Unfortunately it is not. The Dynaco A470 is an ultra-linear transformer with a primary winding equipped with a center tap, two screen grid taps and two plate leads. Instead the Heyboer transformer I received has a primary winding with only a center tap and two plate leads - a Williamson type transformer.
![Devil (666)](./images/smilies/devil.png)
Yes, I could rewire the amplifier to use a Williamson type transformer, but I refuse to compromise on the original design. I consider a Williamson design a step backward. I immediately wrote an e-mail to Heyboer asking about returning it for credit against my account.
This is bad in multiple ways. I will have to get return authorization, pay for shipping to return, wait for the credit back to my account, order from another company and wait again to receive one.
![OhNo! =:o](./images/smilies/scared.png)
Plus Heyboer gets attention for not supplying the correct design part in the market. I have already waited about two weeks since my original order was placed. My next order will be from Triode Electronics.
Joe