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Old 20th August 2014, 11:49 PM   #1
Pauly is offline Pauly  United States
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Default Toroidal PT for SE

Hi

I came a cross and interesting thread re using a toroidal PT for an SE board

Tubelab SE - alternate power transformer

Due to space (and cost) considerations I would like to use a toroid also. Has anybody done anything in that vein since the link was posted back in 2009? I don't want to be unwinding transformers if I don't have to, but I will probably use two (or three) transformers if need be

Thanks
Paul

Last edited by Pauly; 21st August 2014 at 11:35 AM.
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Old 21st August 2014, 12:03 AM   #2
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I built an RH84 design with a toroidal PT (and a voltage doubler to boot). Came out sounding great and not a hint of hum.

See build thread here.

I definitely plan on using toroids in the future as well. One of the only issues I've encountered (at least with Antek toroids) is that they don't have a 5V heater for tube rectifiers.
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Old 21st August 2014, 12:58 AM   #3
Pauly is offline Pauly  United States
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Quote:
Originally Posted by Sodacose View Post
One of the only issues I've encountered (at least with Antek toroids) is that they don't have a 5V heater for tube rectifiers.
Indeed, I don't want to start unwinding trans coils just yet.

I was thinking of going solid state rectifier (I have a box full of MUR860 laying about) but I'm not sure how to achieve a + 300V(ish) B+ AND a -150V(ish) off the same secondary.

Paul
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Old 22nd August 2014, 02:26 PM   #4
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Unwinding toroid isn't that hard. It's a fun learning experience. If the space is an issue, that's more reason to use just 1 transformer.
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Old 22nd August 2014, 02:53 PM   #5
Pauly is offline Pauly  United States
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Originally Posted by Evenharmonics View Post
Unwinding toroid isn't that hard. It's a fun learning experience. If the space is an issue, that's more reason to use just 1 transformer.
A "fun learning experience" is getting a massage in Chinatown. :-)

I'm a notoriously slow builder (and I mean sloooooow), and I am building a Bottlehead Smash and two line conditioners at the same time, so I cannot be putting extra stuff in my path. I also don't know how to measure the voltages to figure out when I've unwound enough to get to 5v. (how do you measure btw?)

I'm actually thinking of going solid state rectifying on the HT side and in so doing eliminating the need for a 5v secondary.

Regards
Cleet.
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Old 23rd August 2014, 06:40 AM   #6
zman01 is offline zman01  Bangladesh
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How much space and $$ will the toroid save you?

A popular choice for TSE builders - should not be much higher in cost vs a good toroid:

https://www.edcorusa.com/search?q=xpwr131

Last edited by zman01; 23rd August 2014 at 06:57 AM.
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Old 24th August 2014, 12:26 AM   #7
Pauly is offline Pauly  United States
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Quote:
Originally Posted by zman01 View Post
How much space and $$ will the toroid save you?

A popular choice for TSE builders - should not be much higher in cost vs a good toroid:

https://www.edcorusa.com/search?q=xpwr131
Yep, bought a xpwr131. Too much hassle otherwise.

Regards
Paul
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Old 27th August 2014, 01:14 PM   #8
zman01 is offline zman01  Bangladesh
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Hi Paul,

How is the project going? Have you decided which OPT to get?
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Old 27th August 2014, 01:49 PM   #9
osscar is offline osscar  Latvia
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hi,

I also can share my experience with toro PT for SE - for may 6C33C (you already know that this babes loves to eat current a lot ) I use two 200W transformers - one per channel. I put them on the L-shaped steel angle and insulate from chassis with rubber O-rings under screws. No vibration or hum or buzz - then put over them 130x130x130 mm transformer cover.
They are Indel (poland) transformers - specifically designed for tube amps with screening and will not cost you a kidney
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Old 28th August 2014, 12:20 PM   #10
Pauly is offline Pauly  United States
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Originally Posted by zman01 View Post
Hi Paul,

How is the project going? Have you decided which OPT to get?
Hi Zman

Still waiting on parts. As a slow builder (I travel a lot and will be in Africa most of October and Novemebr) I am not planning to be finished before lets say mid December.


I ordered the James Audio transformers. Apart from being very aesthetically pleasing to me, the fact that I can can configure for either 2.5K or 3.5K loads and the 4 & 8 ohm taps was a big draw card. I think I'll put the primary inputs on a switch so I can toggle between 2.5K and 3.5K impedence and let my ear decide which is the better.

Regards
Paul
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