Noobie dual secondary question

[NordicNorm]

Howdy All!

I'm trying my hand at building a tube-based output stage for a CDP (using the Lukasz Fikus's Lampizator example).

His transformer PS schematic shows two secondaries - 6.3V and 110V coming off a toroidal transfomer!?

I've never used (or bought) a dual secondary transformer, but when I look at places like partsconnexion et al, all I can see are transformers with two identical secondary voltages (i.e. 6V, 6V; 12V, 12V, etc.).

Am I missing a step here?

[jcx]

for tube amp supplies you need to go to manufacturers of tube amp xmfrs

Hammond Mfg. - Universal Primary - "Classic" Power Transformers

another option is to use separate plate (110 v in your example) xmfr and filament xfmr

[AndrewT]

tube valve amplifiers and their transformers are a specialised area where safety of the builder and user becomes of severe importance.

Sounds like you need to learn about safety.

[NordicNorm]

Andrew: Thanks for your concern regarding my safety. Your reply was condescending and unhelpful. I am not a noobie regarding electronics nor digital circuits (having designed proprietary computer circuits in the early 80's). I am a noob at certain aspects of analog however, which is why I asked the question.

jcx: Thanks for your reply. I was thinking that I might have to do something like that, but according to the wiring schematic on Lukasz's site, it doesn't appear he did!?

http://http://lampizator.eu/LAMPIZAT...Lampizator.doc
(p. 19)

[simon7000]

You can also buy a toroid transformer that has the higher voltage and add a few windings for the filament your self. Be sure to allow for a size that has the spare wattage and also that it has a hollow core. Some come filled with a potting compound to make mounting easier but you can add any windings to those.

Note the primary is wound close to the core and that you have a layer of insulation wrap before you add windings,

[NordicNorm]

Thanks for your helpful suggestion simon7000!

After some research on my part, and revisiting the basics (which I should have done from the start), I've realized that, after being out of the game for 25 years, I had simply assumed there was some advancement that I was unaware of!?

My solution is simple - take the 110V coming off my primary, and the 6V off the secondary!? Doh!

Important lesson here - never forget the basics!

Thanks to all for your suggestions!

[CBS240]

My solution is simple - take the 110V coming off my primary, and the 6V off the secondary!? Doh!

Important lesson here - never forget the basics!

By this do you mean using the mains to feed the power amplifier? I sure hope not.....that you don't forget the basics and provide your (and others) life with adequate isolation....Bzzzztt Not that the voltages in a valve power stage won't kill you anyway, they will.

The suggestion in post 5 seems easiest to implement.

[NordicNorm]

CBS240: I'm not sure I follow you?

Why would tapping the 110V line (off the main transformer) into the anode supply of the rectifier tube kill me (providing it was grounded, etc.)? I am feeding it into a CRC filtered circuit?

[AndrewT]

thread reported.
all discussion of Direct OnLine powering of projects is banned on this Forum. This is for the Safety of members and their relations and acquaintances/users.

[SY]

Norm, direct mains connection is DEADLY DANGEROUS. It is about the only technical area where the forum has explicit rules. There's plenty of discussion about it and a lot of closed threads.

Bottom line: doing that sort of reckless thing may kill you, but more importantly, it may kill some innocent person who accidentally touches your pride and joy. Don't even THINK about it. Go do some research before you inadvertently kill someone.