power output of EL34

[hschaser]

Thanks all for your precious input and advise.
I have another thought about the heater when powref up, using Ac or dc for the heater current which is better? I read online that AC powered heaters are more prone to ac hum. Pls advice.
Thank you

 

[DF96]

AC heaters only hum when wired incorrectly.

 

[hschaser]

AC heaters only hum when wired incorrectly.

Hi DF96

Noted and when you say wired incorrectly what do you mean?

Thanks

 

[hschaser]

And is there anyway we can establish whether a hum is from the heater and not elsewhere?

 

[DF96]

Search on here or on the web for AC heater wiring advice. No point in repeating standard knowledge in yet another thread.

 

[jazbo8]

Check out the sticky.

 

[hschaser]

Ok thanks

 

[planet10]

My DynaMutt (prototype of the Classic Design replacement input board for the ST70) does about 20 w in triode and closetodouble in pentode. An excellent amplifier (i usually have it in triode).

Certainly applicable to any diy EL34 PP amp.

dave

 

[jean michel]

hello ,

me build to similar EL 504 / 502 SE = = = )

http://www.diyaudio.com/forums/tubes-valves/254613-me-clone-proto-el-pl-504-a-2.html

approximatly 2 x 7.5 W to EL 504 or 2 x 8.2 W to EL 502 , and drive to ECC81

the build is up later ( so futur Choke 5 H at 400 V= )

🙄

 

[hschaser]

My DynaMutt (prototype of the Classic Design replacement input board for the ST70) does about 20 w in triode and closetodouble in pentode. An excellent amplifier (i usually have it in triode).

Certainly applicable to any diy EL34 PP amp.

dave

Hi Dave,
Can i have the complete circuit please.
Thanks

 

[hschaser]

hello ,

me build to similar EL 504 / 502 SE = = = )

http://www.diyaudio.com/forums/tubes-valves/254613-me-clone-proto-el-pl-504-a-2.html

approximatly 2 x 7.5 W to EL 504 or 2 x 8.2 W to EL 502 , and drive to ECC81

the build is up later ( so futur Choke 5 H at 400 V= )

🙄

Hi Jean beautiful piece of work there.
How does it sound?

 

[planet10]

Hi Dave,
Can i have the complete circuit please.
Thanks

About halfway down; Classic Valve Design - Dynaco Clone and Original Design Boards

http://www.classicvalve.ca/docs/DynaMutt_octal.pdf

dave

 

[hschaser]

Hi Dave thanks..
You are sure fast!!!!

leon

 

[jean michel]

Hi Jean beautiful piece of work there.
How does it sound?

Hello,

In spite of l use of TV tubes, l ampli good walking(step), the basses are present and he(it) rises well jusqu has 18 - 20 kHz, most hard was d to have some gain without against reaction.

In the future, I am going to modify the supply HT on the part CRC to be in CLC and more stable credit note of the signals, his(her) younger brother SE UL EL 508 works very well, env. 5 W against 7.5 W for him and 8.2 W in version full house EL 502 / 511, c is no top of the range but for less than 200 dollars, j am very satisfied with it

me little build to wood case ...so good home made 😀 ...1 amplifier OTL ( for headphones ) 1 SE UL EL 508 ( 2 x 5 W approximatly ) and 1 SE EL 504 ( up EL 502 / 511 - 2 x 7.5 W approximatly up 8.2 W )

😉