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Old 23rd May 2005, 05:23 AM   #1
tonitze is offline tonitze  Singapore
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Default 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.
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Old 23rd May 2005, 09:34 AM   #2
dhaen is offline dhaen  Europe
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Toni,

I can see why you're worried, 700V is high.
Tango seem to have gone out of business, so I can't find a datasheet - cue for everyone to prove me wrong...
I presume this is the design you are contemplating?
DRD300
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Old 23rd May 2005, 09:44 AM   #3
dhaen is offline dhaen  Europe
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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.
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Old 23rd May 2005, 11:06 AM   #4
GaryB is offline GaryB  United States
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Default Re: Tango XE20S

Quote:
Originally posted by tonitze
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.

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
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Old 23rd May 2005, 11:48 AM   #5
tonitze is offline tonitze  Singapore
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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
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Old 23rd May 2005, 02:35 PM   #6
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Default Re: Re: Tango XE20S

Konnichiwa,

Quote:
Originally posted by GaryB
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.
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
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Old 23rd May 2005, 03:25 PM   #7
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Gary B, I think you are thinking of a Parafeed setup

DRD is a different cup of tea ofcourse.
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Old 23rd May 2005, 04:03 PM   #8
GaryB is offline GaryB  United States
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Quote:
Originally posted by Bas Horneman
Gary B, I think you are thinking of a Parafeed setup

DRD is a different cup of tea ofcourse.

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
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Old 24th May 2005, 01:57 PM   #9
tonitze is offline tonitze  Singapore
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So, that mean I can use the Tango XE20S safely on my DRD 300B PROJECT isn't it?

Toni.
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Old 24th May 2005, 02:03 PM   #10
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Yes I would think so. Since the cathode resistor with the 2k2 resistor forms a voltage divider as well..in other words there is not the full 700V across the transformer but probably closer to 500volts.

However I don't know what the voltage spec is for the Tango. But I guess it would be higher than 500V.
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