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ECL86/PCL86 Schematic
ECL86/PCL86 Schematic
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Old 31st October 2009, 11:17 PM   #11
Tubes4e4 is offline Tubes4e4  Germany
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Hi Ezequiel,

Quote:
Originally Posted by Ezequiel (kel) View Post
Oh well, small signal triode biased by grid leak current, which has a few pros but also cons. But it will work and is simple, indeed.

Regards,

Tom Schlangen
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Old 1st November 2009, 01:57 AM   #12
45 is offline 45  Italy
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Quote:
Originally Posted by Tubes4e4 View Post
Hi TubeKing,



F.e, this one by Bill Douroukis: amp, B+ supply, heater supply.

If too complicated, you can start to simplify the B+ supply.

Regards, Tom Schlangen
If you go for the triode-strapped mode without fb the current source for input triode could not be the best solution, IMHO. You can use some harmonic cancellation when approaching the max power and get a 1-2% THD at 1W and 4-5% at 2W with 350V supply!!
I have this amp with the PCL86. I use a 68K anode resistor for the input triode and 180K for grid of the triode-strapped pentode.
The output stage has fixed bias using the 14V winding of the filament (this can be done if you use the PCL86 only or if you use 12.6V and connect the filaments of two ECL86's in series).
The output transformer is 7K and the output tube works at 340V/22 mA. After 5 years it still works fine. No problems with the anode voltage higher than maximum rating of 300V.
The PCL86 brand is Polamp!

Cheers,
45

Last edited by 45; 1st November 2009 at 01:00 AM.
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Old 1st November 2009, 02:07 AM   #13
tubeman813 is offline tubeman813  Thailand
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Default Schematics of The Minimal

Here is my schematics of my P / ECL 86.

It is a very easy circuit, but the sound is very good.

You need a good 5,1 K OPT.

I use EZ 81 for power supply.

HT is 250 Volt.
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File Type: gif Schematic PCL Frank signature.GIF (9.5 KB, 2012 views)
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Old 4th April 2010, 03:40 PM   #14
becki200 is offline becki200  Germany
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HI Tubeman, thats exactly the same amp i have built. Very nice sound, schematic is known over here in germany
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Old 15th June 2010, 06:03 PM   #15
TubeKing is offline TubeKing  Netherlands
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Do you have the schematic somewhere to share ? I'm looking for the power supply with EZ81 to combine with PCL/ECL86 instead of a solid state PS.
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Old 15th June 2010, 06:29 PM   #16
becki200 is offline becki200  Germany
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Try this..
German site hope you understand

Der Treffpunkt fr Elektronik, Mikrocontroller, Rhre, Forum, Platinen, Schaltungen, Onlineshop
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Old 28th October 2010, 11:15 PM   #17
billbo is offline billbo  Australia
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Default Bill Douroukis SE amp

You cannot go past the constant current source when it comes to running small signal tubes in utmost optimal conditions.
The constant current source reflects an infinite impedance (10's of megohms) load to the triode which dramatically improves distortion and the gain stage is optimal(mu = voltage gain). Also the triode is fixed with no fluctuation of power supply, hence any hum or noise is eliminated from signal path.
I have always used these constant current sources in conjunction with regulated power supplies and I do not use chokes in my supply at all (very heavy and large) with NO hum or noise induced.
Regards
Billy Douroukis..
P.S. sorry for the late input.
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Old 5th November 2010, 08:11 AM   #18
tuyen is offline tuyen  Australia
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ECL86/PCL86 Schematic Send a message via MSN to tuyen
PCL86 Piccolo Triode Amplifier

the "Piccolo" PCL86 Amplifier
Integrated 2w/4w single-ended triode or ultralinear amplifier

Good luck!
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Old 22nd September 2017, 08:00 PM   #19
an2727 is offline an2727
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Default hello

Quote:
Originally Posted by becki200 View Post
HI Tubeman, thats exactly the same amp i have built. Very nice sound, schematic is known over here in germany

Hello

Nice to hat you also built this circuit... i built this circuit which u talk about...i have a lot of buzzing sound when i connect an aux cable... could you send me a few pictures of wiring and precautions u took against oscillations!


i could certainly use some help on this circuit that i built too after seeing it here.

BR

Amit
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Old 22nd September 2017, 10:27 PM   #20
an2727 is offline an2727
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Default schematic for ecl86

Quote:
Originally Posted by billbo View Post
You cannot go past the constant current source when it comes to running small signal tubes in utmost optimal conditions. <snip>
hi...i have been following some of your psosts and and very impressed with your know how on great many thing with tube amps...

i have a bunch of spare ecl86 tubes. the amp that i built isnt very clear nd has heavy distorttion on lower volume notes in the music/song... also i get a huge buzz the moment the aux cable is plugged in. the buzz is non stop and loud till the end is plugged into my cellphone. im getting solid loud volume though when i play music... the sound just isnt very clear. or clean. would u recommend a schematic thats very good?..i listen mostly to jazz.

BR
Amit
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