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-   -   2 OTs per channel? (http://www.diyaudio.com/forums/tubes-valves/15137-2-ots-per-channel.html)

Brian 14th May 2003 05:40 PM

2 OTs per channel?
 
Can a power amp be built with two output transformers per channel? A big one optimized for accurate bass going to the woofer, and a small one optimized for clear and sweet mids and treble going to the wide range driver.
The output from each tranny would be mostly full range so a crossover circuit on the speaker would still be required. I am not seeing this as any kind of biamping solution, only an optimization.

Bas Horneman 14th May 2003 09:05 PM

Actually Doede Douma has something just like that...

http://dddac.de

Well almost ..it is one transformer with 2 secondaries...1 for bass 1 for treble with silver wire..

dhaen 14th May 2003 09:12 PM

Hi,

This has been suggested before, either here or AA.
It's the primaries that have differing requirements.
I think it would be best to put the 2 transformers' primaries in series, with the HF transformer connected to the anode.

Cheers,

Bas Horneman 14th May 2003 11:33 PM

Hi John,

Got the EY81's and topcaps today! Thank you very much!

Here is the link to the transformer page...on Wil's bifilar windings..one with silver wire and one with copper...so not really with 2 secondaries... but nevertheless an intersting concept..

http://www.dddac.de/tp05.htm

I don't understand why you would want the dual primaries? Could you elaborate...?

Cheers,
Bas

dhaen 14th May 2003 11:54 PM

The international man of mystery...
 
Hi Bas,

Glad they got there! International post can be a bit dodgy.:dead:

Doede's 2 Headed dragon:
Interesting concept. I'll have to have a think about what's happening. It's not clear from the pictures, what the winding detail is, but I have some suspicions.

Dual primaries (this principle is for SE, but could be adapted to PP):
I meant 2 transformers: One for HF with low inductance and low capacitance.
The other for LF with High inductance and high capacitance.

In series:
The HF primary is low impedance to LF,
The LF primary is low impedance to HF.
Both transformers get what they want out of life;)

By putting the HF transformer nearest to the anode we ensure that the HF is not lost to ground through the LF transformers primary to secondary capacitance.

Just an idea....

Cheers,

dave slagle 15th May 2003 12:06 AM

Re: The international man of mystery...
 
Quote:

Originally posted by dhaen

In series:
The HF primary is low impedance to LF,
The LF primary is low impedance to HF.
Both transformers get what they want out of life;)

Cheers, [/B]

the two primaries in series will form a voltage divider based on the inductance in parallel with the loads, with a perfectly linear inductance and a resistive load it could be worked out, but in real life i suspect you will get a mess... (that might just sound great)

dave

dhaen 15th May 2003 12:10 AM

Dave,

We're just dreaming:idea:

Any idea what's happening with Doede's dual secondary transformer?
I was wondering if the HF secondary was underneath the LF secondary.

Cheers,

fdegrove 15th May 2003 12:57 AM

KIDS' DREAM.
 
Hi,

Quote:

the two primaries in series will form a voltage divider based on the inductance in parallel with the loads, with a perfectly linear inductance and a resistive load it could be worked out, but in real life i suspect you will get a mess... (that might just sound great)
Yes...a big mess...unless...:

You parrotfeed each OPT...well that's how I dreamt it up anyway..:cannotbe:

Pfffffttttttttttt,;)

Circlotron 15th May 2003 04:47 AM

A top-end-only transformer might be a good thing for a biamped or triamped system. Less turns for less capacitance as someone already said, and maybe the option of fancier core material seeing you arent struggling for inductance at low frequencies. It would be small too so not very expensive. Much easier to diy one too.

Brett 15th May 2003 04:52 AM

Re: KIDS' DREAM.
 
2 Attachment(s)
Quote:

Originally posted by fdegrove
parrotfeed
<i>rawwwkkkk!</i>


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