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Old 7th June 2013, 02:44 AM   #5171
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Quote:
Originally Posted by mhouston View Post
Some nice fresh ideas are here. I like the idea of the partly hidden, angled tubes.
Me too.
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Old 7th June 2013, 10:38 AM   #5172
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Me too.
Yes I like that too.
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Old 7th June 2013, 10:34 PM   #5173
kevinkr is offline kevinkr  United States
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My current amplifiers have been in continuous use since October of 2011 when I completed them. They average about 30hrs a week of use, and are on their second set of tubes. Simple all transformer coupled stage design using a single GM70 and triode connected D3A per channel. The transformer coupled outputs of my line stage float and are direct coupled to the grid and bias networks for the D3As.. Fixed bias is used throughout. No coupling capacitors except in the input of the 26 dht based line stage.

Output power is a little over 20W per channel, and operate full range. The speakers are 100dB+ efficient..

Because of the high voltages involved I have not shared the design. (and won't)

I've sold all of my other amps.. These will suffice and have proven to be extremely reliable in use.
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Old 7th June 2013, 10:50 PM   #5174
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I am currently using a valve amplifier that I built myself.
It has ECC83's on the front end with a tone control into phase splitter into a push-pull EL84 output stage.
Open loop amplifier with no feedback.
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Old 7th June 2013, 11:06 PM   #5175
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Quote:
Originally Posted by McGyver View Post
Ukrainian monoblocks (6B4G in PSE, no feedback, 2C51 and E288CC driver) I bought broken and had to rebuilt
what a beautiful amp !
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Old 7th June 2013, 11:06 PM   #5176
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by kevinkr View Post
My current amplifiers have been in continuous use since October of 2011 when I completed them.

Because of the high voltages involved I have not shared the design. (and won't)

I've sold all of my other amps.. These will suffice and have proven to be extremely reliable in use.
Kevin,

What Op transformer/power Tx did you use?
(Poss PM)?

Regards
M. Gregg
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Old 7th June 2013, 11:25 PM   #5177
kevinkr is offline kevinkr  United States
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All of my power and output transformers were custom built to my specifications. The power transformers for the amps were made to order by Edcor, and the output transformers by Jack Elliano at Electra-Print. The interstages were made by Lundahl.. None were terribly expensive. I use Rod Coleman CCS for heating the GM70s, and LT1084 based pre-regulators to power them. Predictable operating point in the driver stage is provided by a 20mA cascode current source that provides plate voltage to the IT. The plate supply is locally decoupled by large film caps - plate voltage is determined by the transconductance of the driver tube at approximately -2.1V of grid bias. Works quite well, and also obviates the need for a very well filtered plate supply to the driver stage. (Mine still is well filtered)
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Old 8th June 2013, 01:05 AM   #5178
wlowes is offline wlowes  Canada
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Default Everyday its OTL

6c33c OTL. 6np2 input and 6np6 drivers. Computer source (mpdpup on ALIX) driving TDA1541A 6np2 buffered DAC. Lightspeed attenuator. Great pairing with OTLs. Blackgates everywhere.
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Old 8th June 2013, 07:15 AM   #5179
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by wlowes View Post
6c33c OTL. 6np2 input and 6np6 drivers. Computer source (mpdpup on ALIX) driving TDA1541A 6np2 buffered DAC. Lightspeed attenuator. Great pairing with OTLs. Blackgates everywhere.
What are the 8 Tx's for.. are they interstage or heater? Interesting heat isolation for the 6C33C's.

What kind of power out are you getting?

Regards
M. Gregg
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Old 8th June 2013, 07:26 AM   #5180
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Default retro-thermionic: retro-34UL power amp

This amp is my new EL34 the "retro-34UL", Signature EL34 amp. On early listening the amp sounds fast, crisp and SS like. A very natural sounding amp. Valve compliment is NOS Svetlana EL34 and Svetlana 6N1P. Edcor GXSE 6omh ultra-linear OPTs and 10H choke and power tranni are Hammond. Inter-stage caps are Jensen copper, paper and oil with pure silver leads. Biploar caps are used as bypass caps on the EL34s with ceramic sockets for the audio tubes. Rectifier valve is a Golden Dragon 5U4. OPTs are rubber mounted.

Top plate is ABS plastic and base Australian Spotted Gum (oiled). Feet are filled with lead sinkers and rubber glue, silver solder and and silver plated wire used throughout. Topology is Single-end Ultra-linear.
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