transformers between 68 and 78

[rockstah]

what changes if any took place between 68 and 78 to the transformers?

[Bunnest]

Rockstah, my understanding is that the EPA (Environmental protection agency) outlawed certain elements in '75, mercury and lead, which was probably loaded in the iron in the early trannies. Ever notice that heavy "knock" in the old marshalls, that certain frequency that jumps out at ya, I bet that's the reactive mercury and lead (hint mercury magnets was around since like the 50s, hence the mercury name??); Also, ever notice that fire resistant material in the early boards, I think they call it asbestos, that was outlawed also. Too bad, it made the best anti-heat material in the amps...

[Brian Wallace]

What!

Do you know that they still put Mercury filings in your mouth and are only phasing the use of it out this year.

You can still buy slack tubes filled with mercury.

As for lead, the 60/40 solder you buy right now is currently RoHS approved.

[novosibir]

As for lead, the 60/40 solder you buy right now is currently RoHS approved.

Are you absolutely shure about this?

Larry

[OnTheFritz]

I think the Dagnall OT's got rid of the self leads at some point between the years mentioned. Probably closer to the plexi era than later.

[Brian Wallace]

Larry,

Heat of the moment thing. Lead solder is fine if you are a hobbyist according to some of the literature I have read.

Lead solder is still being sold and being used though, so it was not outlawed in 1975.

[Daniel Borotto]

Rockstah, my understanding is that the EPA (Environmental protection agency) outlawed certain elements in '75, mercury and lead, which was probably loaded in the iron in the early trannies. Ever notice that heavy "knock" in the old marshalls, that certain frequency that jumps out at ya, I bet that's the reactive mercury and lead (hint mercury magnets was around since like the 50s, hence the mercury name??); Also, ever notice that fire resistant material in the early boards, I think they call it asbestos, that was outlawed also. Too bad, it made the best anti-heat material in the amps...

Sorry I don't understand which are the asbestos boards in marshall amps. Are you referring to circuit board or to transformer cardboard/paper? Thank you very much!