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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

Look for EL33 PP structure circuit

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#5
leadbelly said:
he really means EL33
Click to expand...

Oops... not a tube i've heard of before... same circuit would work, but with adjustment of cathode R & an OPT with a lot more pimary -- looks much more like an EL84 then an EL34.... i'm using the above as a basis for a PP amp with EL84s leveraged off a pair of Dynaco SCA35s

An externally hosted image should be here but it was not working when we last tested it.


dave
 
#7
http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

Thank you very much for the help of dave and leadbelly. 😀

http://artifactaudio.com/EL33specs.JPG
Ask dave again. Please tell me?
In the webpage "Two valves in Push-Pull".
Va=250V
Vg2=250V
Rk=140 ohm
Vin=13V

I can change the circuit of this 6V6 below its Va , Vg2, Rk and Vin, make it become circuit of EL33 PP?

http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

Make having 296V in the picture into 250V,
Rk =250 ohm is changed into 140 ohm,
Make with 18V into 13V.
Can become EL33 PP in this way?

Thanks.😀
 
#8
Re: http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

RCA245 said:
I can change the circuit of this 6V6 below its Va , Vg2, Rk and Vin, make it become circuit of EL33 PP?

http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

Make having 296V in the picture into 250V,
Rk =250 ohm is changed into 140 ohm,
Make with 18V into 13V.
Can become EL33 PP in this way?
Click to expand...


An externally hosted image should be here but it was not working when we last tested it.


pretty much... i'd put a CCS on the cathodes of the long tail pair and just use it as the phase splitter and gain stage (you might need a higher gain tube) -- this would eliminate the 1st 2 stages.

dave
 
#9
Re: Re: http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

planet10 said:
pretty much... i'd put a CCS on the cathodes of the long tail pair and just use it as the phase splitter and gain stage (you might need a higher gain tube) -- this would eliminate the 1st 2 stages.

dave [/B]
Click to expand...

Dave, thanks your replying.
Sorry ! What is CCS? :dead:


If use this circuit below, OK?
http://www.tubecity.com.tw/images/cir3.gif

Or change the 1st 2 stages (first 6sn7) into EF86 etc . high gain tube?

But change into high gain tube, so become bad linearly?

Thanks.
 
#10
Re: Re: Re: http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

RCA245 said:
Sorry ! What is CCS? :dead:
Click to expand...

Constant Current Source

If use this circuit below, OK?
http://www.tubecity.com.tw/images/cir3.gif
Click to expand...

That is the same circuit, different ouput tubes and details ...

Or change the 1st 2 stages (first 6sn7) into EF86 etc . high gain tube?
Click to expand...

EF86 straffed in triode is excellent.

something like this is what i suggest (note similarities to PP1C above)

dave
 

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#13
Re: Re: Re: Re: http://www2u.biglobe.ne.jp/~tossie/6V6-E.html

planet10 said:


Constant Current Source



That is the same circuit, different ouput tubes and details ...



EF86 straffed in triode is excellent.

something like this is what i suggest (note similarities to PP1C above)

dave
Click to expand...

Hi Dave.
http://www.diyaudio.com/forums/attachment.php?s=&postid=619316&stamp=1113444357

Only is it all right to need two stage? ?
Could you tell me that needs one stage foremost?

Thanks
 
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