No, they’re driving 100dB Fane 12in full rangers.Steve,
Cute little bugger of a 45 amplifier you got there mate.
What speakers are you driving them with? The Omnis?
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I pre-cut the lams before clamping up. The cab was then sanded and oiled once all the holes had been drilled.
The circuit is nothing to write home about. The small size makes it virtually impossible to incorporate any fancy DC supplies or HV regulation. There can be no three stage hi-jinks because again there is no room, nothing but a 9 pin input driver would fit. The driver is simply a Philips Miniwatt ECC88.
The lams themselves are actually 13 x 9.5 x 3/8 in chopping boards, 7 in all, stacked one on top of the other. The available area inside was about 11 x 8.5 x 2in, so not a lot of room for manoeuvre.
The OPTs are a pair of 5K push-pull items that I unstacked and rebuilt as gapped single-ended transformers. The 45s were given to me by two great people from the Audio Talk forum There is a Black Gate WKz inside, that is a long term loaner from another forum member.
Power supply is old school CLCRC: again nothing fancy.
The whole thing was an exercise in seeing how small I could go and still get great sound. It certainly sounds excellent, is quiet and looks nice, so I think I fulfilled the brief. It proves to me that simple still works.
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Yep, I took every possible precaution to avoid noise because of the small size of the chassis.
The silver plates underneath the transformers are non-magnetic 1mm stainless steel. I would have covered the whole underside with it, but didn’t fancy tying to punch holes in it. It was bad enough drilling the bloody stuff.
The silver plates underneath the transformers are non-magnetic 1mm stainless steel. I would have covered the whole underside with it, but didn’t fancy tying to punch holes in it. It was bad enough drilling the bloody stuff.
POV?
You have to help me out here.
What does it mean?
Edit : Yes, I now did an internet search (sorry should have done this earlier so I would not had to respond)
but anyway : I still do not see the connection......
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The last amplifiers in the stack that are still point to point, and I have no desire to rebuild them.
Looking back at these amps reminds me of how I started to build. Most of which examples have been "scrapped"...
A true test bed to the quality and heat tolerances, these amps!
Looking back at these amps reminds me of how I started to build. Most of which examples have been "scrapped"...
A true test bed to the quality and heat tolerances, these amps!
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Steve Cresswell,
That is a great looking little amplifier!
It reminds me of the stereo 45 amplifier I designed and built for using at my work.
My amp did not look pretty, it just sounded good.
You are the first one I remember that mentioned taking a push pull output transformer, and re-stacking the Es and Is, and air gapping it (I built an SE EL34 amplifier, and wrote about modifying PP transformers for SE application, when I did an article in Sound Practices).
Simple amplifiers like yours can be really good.
Just goes to prove Albert Einstein's Quote:
"You should make things as simple as possible, but no simpler".
That is a great looking little amplifier!
It reminds me of the stereo 45 amplifier I designed and built for using at my work.
My amp did not look pretty, it just sounded good.
You are the first one I remember that mentioned taking a push pull output transformer, and re-stacking the Es and Is, and air gapping it (I built an SE EL34 amplifier, and wrote about modifying PP transformers for SE application, when I did an article in Sound Practices).
Simple amplifiers like yours can be really good.
Just goes to prove Albert Einstein's Quote:
"You should make things as simple as possible, but no simpler".
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thank you Thomas Mayer
This morning I am listening to some sweet, sweet music via the pictured amp. It is a design by Thomas Mayer posted on his Vinyl Savor site. That man can design and amp!
I did vary from the schematic for the lack of access to his exact parts list but it is all there in the spirit. It is a glorious sound It is a 6N7 to interstage transformer to a 46. I needed some space and a way to carry the finished amp easily (I am getting older and the knees are giving out) thus the three chassis design. I have only included one "nude" of the signal section interior. I have come to understand that I do not build in a favored style, that's OK. It works for me ;-)) 
Thank you Thomas!
This morning I am listening to some sweet, sweet music via the pictured amp. It is a design by Thomas Mayer posted on his Vinyl Savor site. That man can design and amp!
I did vary from the schematic for the lack of access to his exact parts list but it is all there in the spirit. It is a glorious sound
It is a 6N7 to interstage transformer to a 46. I needed some space and a way to carry the finished amp easily (I am getting older and the knees are giving out) thus the three chassis design. I have only included one "nude" of the signal section interior. I have come to understand that I do not build in a favored style, that's OK. It works for me ;-)) Thank you Thomas!
Attachments
This morning I am listening to some sweet, sweet music via the pictured amp. It is a design by Thomas Mayer posted on his Vinyl Savor site. That man can design and amp!
I did vary from the schematic for the lack of access to his exact parts list but it is all there in the spirit. It is a glorious sound
Thank you Thomas!
Thanks for posting this. I am gathering parts for a 46 build and have looked at Thomas' design among others. Nice to hear a report on the results. I too like your build design. I'm curious about what speakers you are using. Those 46s don't offer much power...
