[Clayton SF]

I was first introduced to Glenn's work when I bought adapters from him on eBay in 2009. And I am still using them today. His 7N7 to 6SN7 adapters have given me the opportunity to listen to some mighty fine Sylvania 7N7 tubes. And I dare say, that they are mighty fine looking, too.

 

[rnros]

Another Glenn OTL nearing completion...

 

[TonyNewman]

Another Glenn OTL nearing completion...

Nice. Very clean layout.
One question - I don't see any bias meters or adjustment - is this not necessary with an OTL amp?

 

[2359glenn]

Self bias with cathode resistors

 

[gibosi]

And the OTL allows one to configure it in ways that Glenn may never have considered, and often it sounds as good or even better than the traditional 6SN7/6AS7.

For example:

A Loewe Radio mesh-plate AZ12 rectifier, manufactured in Berlin around 1940; four Tung-Sol 6BX7 manufactured around 1960 and a pair of Westinghouse mesh-plate UY227 manufactured around 1932. (Hmmm... not the greatest pic... too much space to the left of the rectifier... lol)

Listening to Lizz Wright's new album, "Grace" and it sounds pretty great!

 

[jelt2359]

I thought he forgot about us.
Do you have any news about the transformers?

Haha no. Yes I think he did. I will send him a reminder...

 

[2359glenn]

Haha no. Yes I think he did. I will send him a reminder...

Do you want tojust go back to Lundahl transformers? They are pretty good.

 

[rosgr63]

Haha no. Yes I think he did. I will send him a reminder...

Clayton never forgets, we have parallel paths in Head-Fi, a very nice person and a dear friend.

 

[whirlwind]

Another Glenn OTL nearing completion...

Very nice....does this amp use 5 volt rectifiers.

I see the Lundahl transformer, but no PY500 ?

 

[rnros]

Yes, 5 volt, and no, PY500.

 

[gibosi]

5 volt? This must be a different Lundahl transformer?

 

[rnros]

5 volt? This must be a different Lundahl transformer?

Don't know which other Lundahl you are referring to, this OTL uses the same 5V rectifiers as past GOTLs.
Also the 3V, I assume Glenn has wired this one the same way taking advantage of the different pinouts.
Don't have specs or model # for the Lundhal.

 

[gibosi]

Don't know which other Lundahl you are referring to, this OTL uses the same 5V rectifiers as past GOTLs.
Also the 3V, I assume Glenn has wired this one the same way taking advantage of the different pinouts.
Don't have specs or model # for the Lundhal.

In the past, I was told that it was not possible to use 5V rectifiers with the Lundahl transformer Glenn installed in Whirlwind's OTL. So I am wondering if he is using a different one in your amp....

 

[ru4music]

Don't know which other Lundahl you are referring to, this OTL uses the same 5V rectifiers as past GOTLs.
Also the 3V, I assume Glenn has wired this one the same way taking advantage of the different pinouts.
Don't have specs or model # for the Lundhal.

Same here, 5V and 3V rectifiers in the EL3N currently being built for me. I wonder if the @whirlwind GOTL uses a higher current capable power trans.

 

[rnros]

In the past, I was told that it was not possible to use 5V rectifiers with the Lundahl transformer Glenn installed in Whirlwind's OTL. So I am wondering if he is using a different one in your amp....

OK. The photo I found shows that OTL set up for two PY500s... 9 pin sockets and 42V heaters.
Assuming the transformer is chosen/custom-built for that specific tube voltage.
Could be wrong, but you would still need an octal socket, don't think you could do it with an adapter.