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GU-46 push-pull & single-ended amplifiers
GU-46 push-pull & single-ended amplifiers
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Old 7th January 2018, 06:01 AM   #101
jazbo8 is offline jazbo8
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GU-46 push-pull & single-ended amplifiers
These prices seem quite reasonable.
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Old 7th January 2018, 10:26 AM   #102
thomasweissbach is offline thomasweissbach  Switzerland
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Question about the power supply drawn by Banat (see post 6), I thought about using rectifier tubes, as mentioned before.

Could the diodes be replaced by high voltage vacuum rectifier tubes like the russian B1-0.1/30 (V1-0.1/30)? These are half wave rectifier tubes, this means 4 tubes would be required, when replacing each diode pair by a tube, or like drawn in the navy NEETS Docs

Navy Electricity and Electronics Training Series (NEETS), Module 6 - RF Cafe

Yes... 4 tubes means 20A at 5V... But we already reduced consumption by going SE

They should be able to deliver the A at around 450-500VAC, they are said to be good for 400mA at 30kv.

It could be done by using the 2 serially connected Triad F3x Transformers, one supplying the plus rail and one the minus rail or using two separate Hammond 76VA filament Transformers for each rail with a 0.1R/20W resistor to reduce voltage from 6 to 5V.
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Old 7th January 2018, 08:29 PM   #103
claudiomas is offline claudiomas  France
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just like this
otherwise you get hum

not easy to find 5V CT 10A
triad F-8X only 6A so you need four of this one
one each tube
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Old 8th January 2018, 11:26 AM   #104
thomasweissbach is offline thomasweissbach  Switzerland
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The B-1-0.1/30 has a heater center tap for the drain of the rectified power, I think.

Claudio, the triad F-8X transformers a a good and valuable option to Hammonds 6V Versions.

I attached a small schematic for a PSU with B1-0.1/30 tubes, but forgot to draw bleeder resistors. C is around 50uF per tube.

Thomas
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Old 9th January 2018, 03:22 AM   #105
multi is offline multi  Australia
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The Midlife Crisis - My 833C Amp Build
May be worth reading this insane thread.
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Old 12th January 2018, 07:09 PM   #106
thomasweissbach is offline thomasweissbach  Switzerland
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To all transformer winding specialists, is anybody out there able to wind high quality SE OPTs with the following specifications:

2.5k primary, 4 + 8R secondary, 1200V+ at 0.7A, 20Hz-25kHz frequency range, 170-180W

5k primary, 2 + 4R secondary, 1200V+ at 0.35A, 20Hz-25kHz frequency range, 80W (2 OPTs primary used in parallel, secondary series)

7.5k primary, 1.3 + 2.6R secondary, 1200V+ at 0.24A, 20Hz-25kHz frequency range, 60W (3 OPTs primary used in parallel, secondary series)

Did I forget something?

Trannies should have a safety margin enabling safe use at voltage fluctuations and long run time

I am asking because Mr Ogonowski has never built this type of high voltage and ampere transformers yet and is not sure If he can meet the frequency requirement and safety requirement (I appreciate his open and honest communication very much, all people being that open can only be recommended). The large pp OPTs he built for my 6L6 wxt Quad amp are of outstanding quality.


The same might be with power trannies, primary 240V (!)
the following secondary voltages are required
- 2X 500-0-500V at 0.8A
- 2x 170-0-170V at 0.3A
- 2x 3.15-0-3.15V at 3A
- 2x 5.1-0-5.1V at 20A (!)

And chokes
4x 10H/450mA at 700V
2x 5-10H/700mA at 1200V


Thomas

Last edited by thomasweissbach; 12th January 2018 at 07:22 PM.
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Old 16th January 2018, 07:50 PM   #107
thomasweissbach is offline thomasweissbach  Switzerland
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I startet a separate thread to get names of potential suppliers for the high voltage high current power transformers, chokes and output transformers.

Custom wound high voltage high current OPTs, PTs and chokes needed

This might be a useful listing of suppliers for others too.
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Old 16th January 2018, 08:11 PM   #108
thomasweissbach is offline thomasweissbach  Switzerland
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And it works.

Tomasz from toroidy.pl is going to custom build the toroid power transformers
2 trannies 470-0-470V 800mA for the B+ supply and grid2 of the GU-46 and the voltage amp tubes
1 tranny 2x 170-0-170V 0.3A, 2x 3.15-0-3.15V 3A for the negativ bias and voltage amp tube filaments
2 trannies 5.1-0-5.1V 20A for the DC supply of the GU-46 filament
4 trannies 2x 2.5-0-2.5V 6A for the rectifier filaments

electrodump.nl supplies 2 8H 500/750mA 6.5kV chokes for the anode supply of the GU-46

The 4 10H 500mA 1000V chokes will be from Hammond (193Q), unbeatable for custom winders

This will already be about 70kg of Iron... Some additional kg will come from the large NOS 930uF/450V Nippon Chemicon caps, and the smaller 470uF/450V caps, the cirquit itself and the chassis (which will be made out of Industrial Aluminium profiles like in my last project
6L6 quad push pull monoblock project). This will again be a weight Monster...

Now it's all about the OPTs.

Last edited by thomasweissbach; 16th January 2018 at 08:14 PM.
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Old 19th February 2018, 12:33 PM   #109
thomasweissbach is offline thomasweissbach  Switzerland
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The power transformers from toroidy.pl have arrived.

Well made, good wiring.
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Old 19th February 2018, 12:38 PM   #110
thomasweissbach is offline thomasweissbach  Switzerland
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Back to the output transformers and the way to use the GU-46.

It seems to be difficult to get these large output transformers; i found two of transformer builders that said they are able to build these monsters, but it somehow did not seem to be reasonable; one does not say anything about frequency range, the other offers a range that seems to be far superior to anything else on the market... an this for single ended.

Does anybody have a proposal to run this tube at max. 100W single ended output, in a low distortion area with voltages around 1000V and max. 500mA as a pentode or triode, maybe including some NFB?

Thanks for your feedbacks
Thomas
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