F5 X chromosome mates with SET

CV · 24th September 2009, 09:55 AM

I'd love to hear thoughts on the attached circuit. It's intended for multi-amping a 5 way horn system in summer... hence the emphasis is on the first watt, with hopefully not many more burned up as heat. May also go for a hefty SLA battery supply...

Thus the single ended configuration and output transformer. The biasing is obviously affected by the DCR of the primary so some means of adjustment may be required.

There is also the tantalising possibility of inverting the device polarities and trying a Semisouth part on the output (which means I'd be in for 10 units on the GB... thankfully I'm more accustomed to buying old triodes). Any idea how well these might perform at 1A to 1.4A dissipation?

Any advice or warnings extremely appreciated!
Thanks,
Chris

Nelson Pass · 24th September 2009, 09:01 PM

That's going to be a challenge with the DC through the
transformer.

CV · 24th September 2009, 09:25 PM

Hi Nelson,
Many thanks for your note.
The transformer design is actually the bit I'm most confident about - it will be suitably airgapped to handle the standing current and bifilar wound for good bandwidth. Given this is for multiamping, I intend to size the transformer for each frequency band covered, so the treble amp will have a smaller device that should be good out to 150kHz+.

Am I on a reasonable path otherwise? I will try and cobble a resistively loaded version (with negative power supply) to see how that might behave while I finalise the transformer designs.

Best wishes
Chris

Nelson Pass · 24th September 2009, 11:04 PM

Cobble it together and see what you get. How bad could
it be?

CV · 25th September 2009, 07:22 AM

It's the opposite I'm worried about - what if it challenge triodes and leaves my belief system in tatters?
Thanks for the encouragement and inspiration Nelson,
Best,
cv

i_should_coco · 25th September 2009, 07:42 AM

Quote:

Originally Posted by CV

It's the opposite I'm worried about - what if it challenge triodes and leaves my belief system in tatters?
Thanks for the encouragement and inspiration Nelson,
Best,
cv

Better sell that tube collection quick, before telling anyone if that transpires.

I look forward to reading about the results!

jechentau · 25th September 2009, 08:39 AM

ah post #3 cool

i was just now thinking about such matters.

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24th September 2009, 09:01 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	That's going to be a challenge with the DC through the transformer.

24th September 2009, 09:25 PM	#3
CV diyAudio Member Join Date: Nov 2002 Location: UK	Hi Nelson, Many thanks for your note. The transformer design is actually the bit I'm most confident about - it will be suitably airgapped to handle the standing current and bifilar wound for good bandwidth. Given this is for multiamping, I intend to size the transformer for each frequency band covered, so the treble amp will have a smaller device that should be good out to 150kHz+. Am I on a reasonable path otherwise? I will try and cobble a resistively loaded version (with negative power supply) to see how that might behave while I finalise the transformer designs. Best wishes Chris

24th September 2009, 11:04 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Cobble it together and see what you get. How bad could it be?

25th September 2009, 07:22 AM	#5
CV diyAudio Member Join Date: Nov 2002 Location: UK	It's the opposite I'm worried about - what if it challenge triodes and leaves my belief system in tatters? Thanks for the encouragement and inspiration Nelson, Best, cv

25th September 2009, 08:39 AM	#7
jechentau diyAudio Member Join Date: Feb 2005 Location: Gelderland	ah post #3 cool i was just now thinking about such matters.

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