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6AK6 push-pull output transformers
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tube geek



Joined: 29 May 2010
Posts: 7

PostPosted: Sun May 30, 2010 5:58 pm    Post subject: 6AK6 push-pull output transformers Reply with quote

I'm working on a 6AK6 push-pull project, and I am looking for suggestions on output transformers. I believe s2 used a Mercury, and I have found no info on the Dynotweed OT. I am also seeing 5k to 20k being used. What have you had luck with? Question
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Phil_S



Joined: 23 Oct 2007
Posts: 3741
Location: Baltimore, MD

PostPosted: Sun May 30, 2010 10:02 pm    Post subject: Reply with quote

Duncan's TDSL says that Zout=10K.
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FYL



Joined: 17 Feb 2006
Posts: 654

PostPosted: Sun May 30, 2010 10:18 pm    Post subject: Reply with quote

The 6AK6 is a 7-pin version of the 6G6. Same operating points etc.
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mcrracer



Joined: 07 Dec 2008
Posts: 432
Location: Chicago IL

PostPosted: Mon May 31, 2010 2:03 am    Post subject: Reply with quote

MPS has a 22.5k / 4,8 and 16 ohm
and Weber has a 20k , 10k / 4 or 8 ohms
both priced right.
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BT123



Joined: 28 Dec 2008
Posts: 9

PostPosted: Tue Jun 01, 2010 2:54 pm    Post subject: Reply with quote

Hello,

1st post. I have an S2 Micro amp w/6ak. I don't think the transformer is a Mercury. I can open it up and take a few gutshots if you want.
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tube geek



Joined: 29 May 2010
Posts: 7

PostPosted: Wed Jun 02, 2010 12:30 am    Post subject: 6AK6 push pull output transformers Reply with quote

Thank you BT125,
A couple shots of the transformers would be nice. If you could make note of the transformer numbers that would be way cool, and much appreciated.
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BT123



Joined: 28 Dec 2008
Posts: 9

PostPosted: Wed Jun 02, 2010 2:30 am    Post subject: Reply with quote

Will do - although it might be a day or two before I have the time. I have two of them - 1 is the M1 blackface style with the 2 X 6AK6 tubes, and the other is the M3 Wreck style with 2 X EL91.

From the outside they appear to be the same transformer set.
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Chappy



Joined: 23 Mar 2006
Posts: 44

PostPosted: Wed Jun 02, 2010 4:37 pm    Post subject: Reply with quote

BT123

I am also considering building a PP with 6AK6 and another with EL91's. How do your S2 amps sound?
Chappy
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Cliff Schecht



Joined: 30 Dec 2009
Posts: 2616
Location: Austin

PostPosted: Wed Jun 02, 2010 11:21 pm    Post subject: Reply with quote

I prefer the 10kCT for 6AK6's, 20k is a bit high and sounds weaker IMO. You can always play around with impedance mismatching on the secondary side to see how different primary impedances sound.
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BT123



Joined: 28 Dec 2008
Posts: 9

PostPosted: Thu Jun 03, 2010 5:10 pm    Post subject: Reply with quote

Okay here are some shots. Sorry for the poor picture quality. I couldn't see any #'s on the transformers, so hopefully someone here will recognize what they are.

Thumbnail, click to enlarge.


Thumbnail, click to enlarge.


Thumbnail, click to enlarge.


Thumbnail, click to enlarge.


Thumbnail, click to enlarge.
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BT123



Joined: 28 Dec 2008
Posts: 9

PostPosted: Thu Jun 03, 2010 5:20 pm    Post subject: Reply with quote

I really really like these amps. The M1 is a blackface style amp that is a great pedal platform. I've heard the 6AK6 described as sounding like a small 6L6 and I think that is spot on. While it doesn't have the girth of a 6L6 for clean tones, it does sound surprisingly big and full. Blasting it with a Menatone Kar Krash or a Lovepedal Eternity at bedroom volume sounds crazy good.

The M3 is the Wreck copy. The EL91s sound like smaller EL34s. Really the same comparison as above. Fantastic saturated tone.

I really like going back and forth between the M3 cranked and the M1 with a Kar Krash pedal. They are not the same, but both crazy good and you can tell the sound is somewhat related.

It does look like both transformer sets are the same and you can see in the M1 photos that it looks like you can interchange 6AK6 and EL91 by flipping a switch.
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Chappy



Joined: 23 Mar 2006
Posts: 44

PostPosted: Thu Jun 03, 2010 8:50 pm    Post subject: Reply with quote

BT123

Thanks for the pics and the description of the amps. I can`t wait to get started on my builds. They sound like the perfect amps for me for home use only.

Cheers
Steve
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tube geek



Joined: 29 May 2010
Posts: 7

PostPosted: Thu Jun 03, 2010 10:46 pm    Post subject: Reply with quote

BT123,
Thanks for the photos, even though there are no numbers on the trannys the shots were cool to look at.
Thanks for the effort,
Tube Geek
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Cliff Schecht



Joined: 30 Dec 2009
Posts: 2616
Location: Austin

PostPosted: Thu Jun 03, 2010 11:30 pm    Post subject: Reply with quote

The first thing that comes to mind when looking at those trannies is Hammond. At least for the bigger one, it looks like a 272 series.
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Chappy



Joined: 23 Mar 2006
Posts: 44

PostPosted: Fri Jun 04, 2010 12:28 am    Post subject: Reply with quote

Before S2 shut down his website I took some notes to help me with my builds. All three of his small amps used Mercury Magnetics transformers. Images I have of the "Wrecktified" and the "Blackface" show black transformers without any labelling. His "Van Plexi" also used MM trannys but these were not painted black. Unfortunately I cannot make out the labels on the low quality image that I have of the Van Plexi amp.

Steve
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