Summing Amp Transformers

moley1390 · 6th June 2012, 10:46 AM

Hi all, this is my first post on the forum!

I was wondering if anybody had suggestions for input/output transformers for a summing amp? I'm doing up a SM-Pro Audio summing amp I got 2nd hand, and am willing to change just about any part of it.

I don't mind spending a fair bit on the Output transformers, thinking maybe Carnhill CA-18-VTB1148, but I'd like to keep the input transformer cost down, seeing as I'll need 8 of them! I've heard Edcor transformers are pretty good for the money, and commonly used in mods, wondering if anybody could recommend one?

Thanks in advance!

Scott

bear · 6th June 2012, 12:39 PM

Sorry, what is a summing amp?
What does it do?
Not familiar with the term...

and, anyhow, what is wrong with the transformers in the unit now?

_-_-bear

gk7 · 6th June 2012, 01:15 PM

Quote:

Originally Posted by bear

Sorry, what is a summing amp?

An example:
Tube Tech / SSA 2B Stereo summing amplifier

moley1390 · 6th June 2012, 01:24 PM

That's the type. The one i've got a hold of is a much cheaper version, SM Pro Audio ? PM8 ?

Scott

Holger1975 · 8th June 2012, 11:13 PM

Hi. I am also New to this Board but just ordered a Lawo DV975 summing Card with Haufe transformers. Don't take it too serious what i suggest as i am also new to the DIY hobby, but maybe it helps for your research.

AndrewT · 10th June 2012, 05:19 PM

I had a look at the SSA 2B link.
I think they are selling a normal two channel amplifier with a summing/mixer circuit on the input/s.
i.e. an inverting channel with 5 input resistors to link up 5 sources.

moley1390 · 11th June 2012, 02:18 PM

Thanks for that reply Holger1975, looks interesting.

Any other suggestions?

Cheers,
Scott

moley1390 · 18th June 2012, 05:00 PM

Any other suggestions? All suggestions (type, brand, etc.) would be greatly appreciated!

6th June 2012, 10:46 AM	#1
moley1390 diyAudio Member Join Date: Jun 2012	Summing Amp Transformers Hi all, this is my first post on the forum! I was wondering if anybody had suggestions for input/output transformers for a summing amp? I'm doing up a SM-Pro Audio summing amp I got 2nd hand, and am willing to change just about any part of it. I don't mind spending a fair bit on the Output transformers, thinking maybe Carnhill CA-18-VTB1148, but I'd like to keep the input transformer cost down, seeing as I'll need 8 of them! I've heard Edcor transformers are pretty good for the money, and commonly used in mods, wondering if anybody could recommend one? Thanks in advance! Scott

6th June 2012, 12:39 PM	#2
bear expert in tautology diyAudio Member Join Date: Apr 2002 Location: New York State USA	Sorry, what is a summing amp? What does it do? Not familiar with the term... and, anyhow, what is wrong with the transformers in the unit now? _-_-bear __________________ _-_-bear http://www.bearlabs.com [...2SJ74 Toshiba bogus asian parts - beware! ] -- Btw, I don't actually know anything, FYI --

6th June 2012, 01:24 PM	#4
moley1390 diyAudio Member Join Date: Jun 2012	PM8 Summing Amp That's the type. The one i've got a hold of is a much cheaper version, SM Pro Audio ? PM8 ? Scott

11th June 2012, 02:18 PM	#7
moley1390 diyAudio Member Join Date: Jun 2012	Summing Amp Transformers Thanks for that reply Holger1975, looks interesting. Any other suggestions? Cheers, Scott

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8th June 2012, 11:13 PM	#5
Holger1975 diyAudio Member Join Date: Jun 2012 Location: germanski	Hi. I am also New to this Board but just ordered a Lawo DV975 summing Card with Haufe transformers. Don't take it too serious what i suggest as i am also new to the DIY hobby, but maybe it helps for your research.

10th June 2012, 05:19 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I had a look at the SSA 2B link. I think they are selling a normal two channel amplifier with a summing/mixer circuit on the input/s. i.e. an inverting channel with 5 input resistors to link up 5 sources.

18th June 2012, 05:00 PM	#8
moley1390 diyAudio Member Join Date: Jun 2012	Any other suggestions? All suggestions (type, brand, etc.) would be greatly appreciated!

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