ECL86/PCL86 Schematic

[TubeKing]

Any suggestion for a simple ECL/PLC86 SE Amp ?

 

[revintage]

This one will give you in the ballpark of 3W at 1% THD with low Zout.

 

[TubeKing]

Hi Lars,

Thnx seems nice, did you build it ?

 

[revintage]

It´s a SE version of whatis discussed here:

http://www.diyaudio.com/forums/tubes-valves/151220-spud-schade-pp-anti-triode-ecl86.html

 

[bigwill]

revintage, out of curiosity, what kind of Zout do you get with that circuit?

 

[Ezequiel (kel)]

ok SE ECL86 very simple

1.000.000 de Circuitos Eletrônicos: Amplifier tube ECL86

 

[revintage]

revintage, out of curiosity, what kind of Zout do you get with that circuit?

You get the same Zout as if the E(C)L86 had been triodestrapped.

 

[lquintas]

simple PCL84 SE amp

Recently I built this one with two PCL84:

http://www.diyaudio.com/forums/attachment.php?attachmentid=67204&d=1152603590

It sounds nice and it is easy to build:

 

[tubeman813]

Hi, I am new to this forum.

I also builded a E / PCL 86 SE Mono Block with EZ 81 rectifier.

This was for our THAI DIY Low Cost Project.

The price of the material should not exceed 10.000.- Thai Baht, around 200.- Euros.

The funny thing is, that the sound quality is very good.

A friend of mine has made me very good OPT for the E / PCL 86.

They are a little big but they deliver a nice bass.

It makes fun to listen to this Amps.

 

[Tubes4e4]

Hi TubeKing,

Any suggestion for a simple ECL/PLC86 SE Amp ?

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

 

[Tubes4e4]

Hi Ezequiel,

ok SE ECL86 very simple
1.000.000 de Circuitos Eletrônicos: Amplifier tube ECL86

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

 

[45]

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

 

[tubeman813]

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.

 

[becki200]

HI Tubeman, thats exactly the same amp i have built. Very nice sound, schematic is known over here in germany

 

[TubeKing]

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.

 

[becki200]

Try this..
German site hope you understand

Der Treffpunkt für Elektronik, Mikrocontroller, Röhre, Forum, Platinen, Schaltungen, Onlineshop

 

[billbo]

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.

 

[tuyen]

PCL86 Piccolo Triode Amplifier

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

Good luck!

 

[an2727]

hello

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

 

[an2727]

schematic for ecl86

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