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Old 24th December 2012, 01:36 PM   #1
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Default 12E1 push pull poweramp

I have rewired my biggest tube amp ( until now )

It is a push pull amp with 12E1 powertubes driven by 6n6p.
It has a separate over the top powersupply with 300VA toroid, bridge rectifier, 500uF capacitor and split into 2 rails with 2 big 5H chokes and 100uF capacitors.

I used Hammond 1650K output transformers and nos philips coupling capacitors.
The amp can deliver more then enough power in the lower frequencies i think mainly because of the low output impedance of the tubes.

The 12E1 tubes run at around 260V A-K and 40V negative at 120mA.
They are ultra linear connected.

More info like schematics will follow...
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Old 24th December 2012, 02:18 PM   #2
roline is offline roline  United States
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The 12E1 tubes are known for being a little stubborn , needing a good solid driver. I've designed the 6N6P into driver circuits for KT88 tubes for their drive abilities and understand your selection. I'm interested in how much feedback you needed to use with the 3.4K outputs. I've used KT88 and 6550 outputs with 4.3k with minimal feedback with success, but I've not played with the 12E1 yet... Very nice amp, I have yet to master the P-T-P wiring and make it look good.... More pics of the under body please!!!!
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Old 24th December 2012, 03:34 PM   #3
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Very nice work!

A possible PSU refinement to consider is the addition of a "hash" filter made from a high current RF choke and a 1000 pF. mica or NPO ceramic cap. between the 500 μF. 1st filter cap. and the pseudo dual mono chokes. The background will be a bit "blacker".
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Old 24th December 2012, 03:58 PM   #4
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by roline View Post
The 12E1 tubes are known for being a little stubborn ,
Could you explain this some more?
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Old 24th December 2012, 04:38 PM   #5
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Perhaps the 12E1 data sheet will prove useful. The type was originally intended for use as a regulator pass device.
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Old 24th December 2012, 06:52 PM   #6
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Quote:
Originally Posted by roline View Post
The 12E1 tubes are known for being a little stubborn , needing a good solid driver. I've designed the 6N6P into driver circuits for KT88 tubes for their drive abilities and understand your selection. I'm interested in how much feedback you needed to use with the 3.4K outputs. I've used KT88 and 6550 outputs with 4.3k with minimal feedback with success, but I've not played with the 12E1 yet... Very nice amp, I have yet to master the P-T-P wiring and make it look good.... More pics of the under body please!!!!
Here are a few detailed pics.

You can see I have fitted 2 terminals with lugs at each of the 6n6p tubes. One is connected to gnd, the other to V++ with a capacitor across it. Now you can solder resistors directly from the sockets to the terminals. Also note the gridstopper that is soldered directly to the tube socket for the shortest of distance to improve stability.
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Old 25th December 2012, 12:26 AM   #7
djn is offline djn  United States
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Nice work. I am looking forward to seeing the schematic.
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Old 25th December 2012, 11:42 PM   #8
12E1 is offline 12E1  United Kingdom
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Quote:
Originally Posted by sevenup2278 View Post
I have rewired my biggest tube amp ( until now )

It is a push pull amp with 12E1 powertubes driven by 6n6p.
Nice pics and very neat build. I have a 12E1 project in the works, but have yet to start cutting metal. I chose the number for my user ID here simply because I have a few and they are nice to look at.
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Old 29th December 2012, 07:14 AM   #9
S11E12 is offline S11E12  Viet Nam
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Really nice amp!
I'm going to build S11E12 PP power amp with Quad II schematic. But my OPT has not CFB like quad II.
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Old 7th January 2013, 08:46 AM   #10
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Quote:
Originally Posted by djn View Post
Nice work. I am looking forward to seeing the schematic.
Schematic is pretty much like this one: http://www.triodedick.com/annastasia...rsterker_1.gif

Simple cathodyne phase inverter and UL connected 12E1.
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