Simple SE, Antek Transformer

[wushuliu]

I've read some mentions of people using the Antek AN-2T350 for SimpleSe. Do any modifications have to be made? I do not see 5v winding and the 6.3v is 4A, not 5.

[rknize]

What are your goals (which tubes and what options)?

The 6.3V 4A limitation technically limits you to EL34 and 6L6 types. That said, these transformers have more capacity than their high-level specs suggest. If you wanted to run KT88s, it could probably handle the extra load.

You will have to use the solid state rectifier option or get an external 5V transformer. Or, in true DIY fashion, you can wind your own 5V winding around the toroid. It's actually quite easy because you don't need that many windings and you literally can just wrap some wire of sufficient size around the outside of the toroid. Just make one or two windings, measure the voltage you get, and do the math. You want to go 5% or so over 5V since it will sag. However, this may push the transformer a bit too hard in terms of total VA. This is a function of the primary winding capacity and the size of the core. If you overload it too much, it may overheat. You'd have to do the math and check. If you tell us your goals, we can help you with this.

I would suggest the AN-4T360 instead. It costs a bit more, but has more 6.3V capacity and plenty of surplus VA to handle an extra winding, if you choose that route.

[wushuliu]

Originally Posted by rknize

What are your goals (which tubes and what options)?

The 6.3V 4A limitation technically limits you to EL34 and 6L6 types. That said, these transformers have more capacity than their high-level specs suggest. If you wanted to run KT88s, it could probably handle the extra load.

You will have to use the solid state rectifier option or get an external 5V transformer. Or, in true DIY fashion, you can wind your own 5V winding around the toroid. It's actually quite easy because you don't need that many windings and you literally can just wrap some wire of sufficient size around the outside of the toroid. Just make one or two windings, measure the voltage you get, and do the math. You want to go 5% or so over 5V since it will sag. However, this may push the transformer a bit too hard in terms of total VA. This is a function of the primary winding capacity and the size of the core. If you overload it too much, it may overheat. You'd have to do the math and check. If you tell us your goals, we can help you with this.

I would suggest the AN-4T360 instead. It costs a bit more, but has more 6.3V capacity and plenty of surplus VA to handle an extra winding, if you choose that route.

Hi Russ, my goals are modest. This will be my first tube amp build and will be powering full range from 200hz up. I was planning to use EL34. I have some 6L6s, so I could use those too. My intention was to use solid state rectifier anyway, so the Antek seems to fit the bill!

[rknize]

I would say that it does, yes!

[spopepro]

From the datasheet, it appears that it has 2x 6.3v @ 4A. You would actually have 8A in parallel. More than plenty.

[wushuliu]

So with solid state I get 1.4 rectifitcation, correct? So with 350-0-350 that gives me ~490v for B+. If I keep an EL34 within max Diss per George's chart will any EL34 work or will I have to trial and error ones that will go that high?

[wushuliu]

Never mind, i see max plate voltage is 800v...