Sylvania SCO3 Phono Amp Conversion.

[Sonny ReVerb]

The 6V6s are metal cases, look at the bases. They are Sylvanias, see the logo on the left, and also marked with a Mullard logo too. Never seen that before.

Yup, you're right David. Sorry. The tube chart threw me off. The yellow hexagon has 6V6 inside it. They must not be the original tubes.

Here is a Sylvania 6V6 showing the yellow hexagon:

[img:597:386]http://img199.imageshack.us/img199/8444/6v6metal.jpg[/img]

Here are the smoked glass Sylvania 6V6GT I mistook them for:

[img:134:155]http://img193.imageshack.us/img193/9632/sylvania6v6.jpg[/img]

[Firestorm]

Yes, I thought about that power transformer as well.

Some say a rusty transformer can screw up the eddy currents in a transformer.
I was always told that a crusty, rusty transformer should be replaced.

Interestingly enough, I was reading at the Mercury Magnetics site and they have a article about it.
They state that the rust can actually make the transformer run cooler.

The iron oxide is an insulator and most transformer lamination's are intentionally oxidized for this purpose.

Here is the article.
Comments?

http://www.mercurymagnetics.com/pages/n ... mernik.pdf

That is fascinating. It still implies that the rust has altered the behavior of the tranny. I suppose we have to take their word for it that the change was beneficial, since I, at least, don't really understand the DNA of transformers well enough to disagree. Seems odd somehow, though.