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E130L PP Power Amplifier
E130L PP Power Amplifier
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Old 13th November 2020, 10:05 AM   #1
frentec is offline frentec  France
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Default E130L PP Power Amplifier

Hi All,

I'm just about to start a Push Pull Amp build using E130L Tubes, it will be a dual mono in one enclosure, output transformers are being custom built in Poland, input impedance 1.6k, phase splitters will be 6n6p's, grid v regs will be 0A2 gas tubes, the plan is for 50/60 watts into 4/8 ohms. This is my first Power Amp build, so any advice help on this would be appreciated. Everything I need is ordered, I've probably forgotten something.
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Old 13th November 2020, 10:38 AM   #2
Kay Pirinha is offline Kay Pirinha  Germany
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Did you manage to get four E130L tubes?
Best regards!
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"I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)
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Old 13th November 2020, 11:20 AM   #3
artosalo is offline artosalo  Finland
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Quote:
This is my first Power Amp build, so any advice help on this would be appreciated.
Your schematic would make it easier to comment.
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Old 13th November 2020, 11:25 AM   #4
v4lve lover is offline v4lve lover  Netherlands
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E130L PP Power Amplifier E130L PP Power Amplifier
He has six now i believe i send him two in the mail, and im doing the PCB design for the phase splitter power supply and bias arrangement.


Currently we are thinking 6N6P phase splitter, long tailed pair with a two transistor current sink in the bottom, i really cant tell you the gain of this arrangement(16-20 i think) but some feedback may be needed to get the amp sensitivity right. As from what i understand he already has a preamp. According to the datasheet the E130L at 1K6 anode load and -17V negative need about 9VRMS to drive them to full output power.

Anode resistors would be around 18K with a total tail current of 20mA coupled by two 470nF caps into the 68K grid leaks connected to the bias servo.

For the bias i was thinking of using the plug in modules ive made a PCB for to set the bias, see schematic and board attached, this will need a time delay to synchronize the application of B+ and bias to the tubes.
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File Type: jpg Autobias Plug in board schematic.jpg (394.5 KB, 494 views)
File Type: png Autobias plug in board board.png (103.3 KB, 495 views)
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Old 13th November 2020, 11:59 AM   #5
frentec is offline frentec  France
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Default e130L

Quote:
Originally Posted by Kay Pirinha View Post
Did you manage to get four E130L tubes?
Best regards!
Yes Kay, I have some, 4 Siemens & a couple of Philips from Florick, al NOS
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Old 13th November 2020, 12:06 PM   #6
frentec is offline frentec  France
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Default Schematic

Quote:
Originally Posted by artosalo View Post
Your schematic would make it easier to comment.
It's loosely designed using the Power Amp section of Martin Ecksteins design, with some changes highlighted by Florick, I haven't got everything together yet, I will sit down & design a proper schematic here, or at least scribble one out.
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Old 13th November 2020, 01:13 PM   #7
frentec is offline frentec  France
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Default Schematic

Here is a schematic, that is a rough idea atm.
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File Type: jpg IMG_2307.JPG (729.4 KB, 463 views)
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Old 13th November 2020, 01:15 PM   #8
frentec is offline frentec  France
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Default Schematic

The safety switching will altered obviously the Phase splitters are different than in this drawing.
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Old 13th November 2020, 01:27 PM   #9
frentec is offline frentec  France
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This will mostly be driven by 2P29L DHT preamp, using Ale Moglia's Gyrators, running fairly hot at 17.5 milliamps.
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Old 13th November 2020, 03:19 PM   #10
artosalo is offline artosalo  Finland
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Quote:
...output transformers are being custom built in Poland, input impedance 1.6k
That schematic shows a special output transformer with separate UL-winding. Are you going to have such opt ?

The 6N6P LTP with E130L output stage require some 2 Vrms input voltage to get full output power. If you are building hifi-amplifier, you will need at least 10 dB... global negative feedback. That is, the drive voltage from the preamp should be some 6 Vrms or more depending of the overal gain of the 6N6P/E130L-amplifier.

Concerning the 6N6P LTP, do you want to keep it full tube LTP or do accept solid state components as CCS (tail) ?
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