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    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tango XE20S voltage rating?

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tonitze

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Joined 2003
#1
Tango XE20S

Just wanna confirm with you guys whether this output trafo suitable for DRD 300B. I've been warned that the opt. insulation of this trafo might not be able to take higher voltage of B+. May be you guys have different opinion on this. Thanks.

Toni.
 
#3
I just had an idea:

The idea is to elevate the transformer cores to 200v or so, and enclose the cases so that no one can touch them.
But presumably these transformers look pretty? And you want them on show?
How about enclosing them in transparrent acrylic? It could make for a unique "glassy" design.

May be you think I'm mad? But it would work as long as you leave some distance between the acrylic and valves.
 
#4
Re: Tango XE20S

tonitze said:
Just wanna confirm with you guys whether this output trafo suitable for DRD 300B. I've been warned that the opt. insulation of this trafo might not be able to take higher voltage of B+. May be you guys have different opinion on this. Thanks.

Toni.
Click to expand...


Well the Tango XE20S can certainly handle the voltages but it is not designed for use in DRD applications. Its a gapped single ended transformer which can handle quite a bit of DC current. A copy of the datasheet can be found here:

http://www.pmillett.com/images/Tango_XE20S.PDF

Since its designed to run with a lot of DC current, its inductance is somewhat limited and its also physically larger than needed. In the DRD application there is no DC current in the primary so you don't need the same airgap and you can have a lot more inductance.

If I had a pair of XE20S transformer then I'd probably build a more conventional singled ended 300B amplifier and get rid of that DRD capacitor, but thats just me.

---Gary
 
#5
Dhaen and Gary, thanks a lot for the info.Seems that I have to abundant the DRD 300B project then untill I get the proper trafo and choke from Electra Print.

Dhaen,

Correct!! That the DRD 300B that I would like to try but with the 6AN4.


Toni
 
#6
Re: Re: Tango XE20S

Konnichiwa,

GaryB said:
In the DRD application there is no DC current in the primary so you don't need the same airgap and you can have a lot more inductance.
Click to expand...

I would like to note that you are quite mistaken. In the DRD application around 90mA standing DC current flow in the primary. I would STRONGLY advise against using a transformer without airgap there, as would Jack Elliano, if he where to read this....

Sayonara
 
#8
Bas Horneman said:
Gary B, I think you are thinking of a Parafeed setup 😉

DRD is a different cup of tea ofcourse.
Click to expand...


Mea culpa - thanks to Bas and Thorsten for pointing out my error. It was early Monday morning and I must not have had enough coffee 😱 .

For the DRD circuit it looks like the XE20S would work fine.
Thanks,
---Gary
 
#13
An important issue in transformer voltage ratings is the potential between any winding and the core/case. It will have been flash-tested at a much higher voltage (maybe 2KV or 3KV) than the rated voltage. However continued use can cause breakdown as the insulation can deteriorate under stress and time.
This is why I agreed with Toni's caution until the transformer's rating was known, and suggested a way to get round the problem if it was insufficient.

The bottom line is: Find the Tango spec. and act accordingly.

NB The peak voltage (with respect to chassis) of this system will exceed 1400V. If Tango say 700V is OK then they will have accommodated for this.
 
#14
The bottom line is: Find the Tango spec. and act accordingly.
Click to expand...

That is very good advice John. But I've never seen a voltage rating on a transformer dataheet (apart from Lundahl)

My transformers are pretty unique in that they have a datasheet. (One Electron) but there is no voltage rating declared. Luckily one can email John Atwood 🙂

Best thing to do I think is to post another thread with the heading : "Tango XE20S voltage rating?"

someone out there must know...??

Assumptions have led to many a disaster. However is it not safe to assume that Tango (one of the premier transformer companies on the face of the planet) ...have built this tranny for the 300B which typically has b+ of 400-480Vdc? (and is that not the effective voltage across this transformer, even in the DRD circuit?)

I'm not challenging your way of looking at it John....that is the safest way.....I'm trying to have you guys have a look at my assumptions .:angel:
 
#18
XE-20 data sheet

Tango is still around. They were re-organized as "ISO / New Tango" a couple of years ago. The only place I know of that sells them is Noguchi Transformers in Tokyo, and EIFL Export (somewhere in Japan).

Unless you speak Japanese, though, I doubt that you can get any info from Tango directly.

Here's the XE20S datasheet:

http://www.pmillett.com/images/Tango_XE20S.PDF

Unfortunately no mention of voltage rating.

Pete
 
#19
Re: XE-20 data sheet

pmillett said:
Tango is still around. They were re-organized as "ISO / New Tango" a couple of years ago. The only place I know of that sells them is Noguchi Transformers in Tokyo, and EIFL Export (somewhere in Japan).

Unless you speak Japanese, though, I doubt that you can get any info from Tango directly.

Here's the XE20S datasheet:

http://www.pmillett.com/images/Tango_XE20S.PDF

Unfortunately no mention of voltage rating.

Pete
Click to expand...


That's the problem. Anyway, I'll still continue the project using the XE20S despite the risk involved. If the trafo kaput then that's it.
 
#20
Re: XE-20 data sheet

pmillett said:
Tango is still around. They were re-organized as "ISO / New Tango" a couple of years ago. The only place I know of that sells them is Noguchi Transformers in Tokyo, and EIFL Export (somewhere in Japan).
Click to expand...

There's a third address in Japan, but you should buy a certain quantity, not just a pair of transformer. :cannotbe:
Prices are quite good. Perfect for a gruop buy.

Massimo
 
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