Doubt of the moment .... the ECL84 is effectively the little sister of ECL86 ?

[kagliostro]

Is the ECL84 effectively usable for audio purpose as her bigger sister the ECL86 ?

and the ECL82 is the smaller of the serie ?

Thanks

K

[sluckey]

They are all similar. None are pin compatible with the others.

[kagliostro]

Many thanks Steve

All are usable for audio purpose ? (doubt solved - the ecl84 can be used as audio tube - sometime my brain refuses to collaborate)


Franco

[darryl]

The ECL84 is equivalent to the 6DX8 and the Russian 6F4P. They are quite capable of being used for audio purposes.

[kagliostro]

Ciao Darryl

I've found something on my archive that remembered me they can be used for audio







           

and not only for the use indicated:


The Philips ECL84 is a triode output pentode amplifier designed for class A1 use.The triode section was designed for a variety of uses including sync separation. The pentode was designed for use as a video output stage. Introduced in 1958 when the UK had a 405 line VHF television service and a video bandwidth of 3 MHz maximum.


Source National Valve Museum

Franco

[darryl]

I've found something on my archive that remembered me they can be used for audio

Perhaps you should update your archives . . .

[kagliostro]

Archive updated 


Many Thanks Darryl

Franco

[tubenit]

Franco,

Look at reply #5 on this thread about low watt push/pull amps:
http://el34world.com/Forum/index.php?topic=12526.0

I built the SoLow Watt using p/p ECL84's.  Nice amp & it had an amazing bass response for such a small tube, IMO.

And there is a fairly lengthy thread on this amp on TAG complete with pictures and soundclips of different guys building the amp:
http://ampgarage.com/forum/viewtopic.php?t=17599&highlight=solow+watt+amp

The TAG guys that built the amp were fairly complimentary of the tone/design.

with respect, Tubenit

[kagliostro]

Many Thanks Tubenit

Those schematics and links are really as cacio sui maccheroni 

Have you an idea on the output power of the ecl84 in PP ?

---

I was thinking to the 3 tubes in order of power to be ecl82 - ecl84 - ecl86 but evidently I was wrong

the right progression is ecl84 - ecl82 - ecl86







ecl84 has a plate dissipation of 4W - elc82 has 7W - ecl86 has 9W

Again Thanks

Franco

[tubenit]

Franco,

The amp had about 3-4 watts of power with ECL84 p/p.  The thing that surprised me was the amount of rich bass tone that those tiny tubes had.  They sounded like a bigger tube at a very low volume.  Pretty easy to overdrive the tubes, IMO and not a lot of headroom. 

IF you added  LNFB (local negative feedback) around the second gain stage,  I think you could get a reasonably decent clean tone.  You could probably try the Dumblish style of LNFB to see if that worked?

With respect, Tubenit

[kagliostro]

Thanks for the answer Tubenit

3-4W is enough for a small amp

I've ordered some 6Ф4П (6F4P) on ebay and now I'm waiting for it 

Did you used a recovered OT or one among the Hammond's ?

Franco

[tubenit]

I don't remember for sure?  It may have been one of the Hammonds?   Shortly after I built the amp, someone wanted to buy it and I sold it.

With respect, Tubenit

[kagliostro]

someone wanted to buy it and I sold it.

   

Franco