JJ 2A3-40 for Lynn Olson Amity

[Tubenstein]

I just received a circuit diagram of Amity and both from the same date.

Both Lundahl LL9202AM and LL1620AM are adequate for Amity application. But I wonder which one is better for the application.

My friend says both Lundahl transformer can be made with air gap.

Any thoughts??

 

[indra1]

Why don't you read the datasheets and tell us what's on your mind?

 

[Tubenstein]

Why don't you read the datasheets and tell us what's on your mind?

My friend told me LL1620AM is good as he is building the same amplifier.

 

[indra1]

Something is in your mind you are not telling us. What concerns you?

 

[978HK]

What do you think 6.6K toroidal PP output transformer

I haven't had experience with them. I used LL1620 which was replaced with O-netics entry level 6k6.

 

[Tubenstein]

At first I consider to use Toroidy transformer with tentlabs autor-bias module to avoid the DC imbalance, however, if cost is put into consideration.

Sounds like the LL1620AM PP with air gap is a better deal as auto-bias module not cheap!

 

[Tubenstein]

I haven't had experience with them. I used LL1620 which was replaced with O-netics entry level 6k6.

Did you have LL1620 amorphous core?

 

[analog_sa]

The AM version has one obvious advantage when introducing a meaningful airgap: there will be plenty of inductance left. Otoh i am not sure how great is Lundahl's idea of using the same size core when moving from steel to AM.

 

[978HK]

Did you have LL1620 amorphous core?

Just the standard version.