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Old 10th October 2012, 10:59 PM   #11
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There are many cheeper ecc83 out there. I have some very inexpensive Chinese ones that sound surprisingly like Telefunken or Mullard..

Is 200V enough for ecc83? I find ecc83 sounds better with HT at 280V ...

If you don't need all that gain, and can't boost the volts then e88cc (or pcc88) could be a choice. You may need to elevate the heaters on e88cc though...

Personally, I would probably use ecc99 if it was 9-pin
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Old 11th October 2012, 03:54 AM   #12
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I am using a 12bh7a to drive my el34s... I like it better than the ecc99 with both running about 300V and 10 mA per side. Gain is about the same.
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Old 11th October 2012, 04:47 AM   #13
hooman is offline hooman  Iran
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Quote:
Originally Posted by soulmerchant View Post
There are many cheeper ecc83 out there. I have some very inexpensive Chinese ones that sound surprisingly like Telefunken or Mullard..
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Old 11th October 2012, 05:04 AM   #14
ChrisA is offline ChrisA  United States
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Originally Posted by navidstat View Post
Hi

I have Single ended Amp (DIY) with two El34, and drive them with ECC81.
one Section for each el34 and plate choke instead of resistor.
about 200 volt on Anode with 4mA.

what kind of topology (SRPP , Cascode or Anode follower ) is best for Drive El34?
thanks

One of the things you can do is use a 12AX7 but with local feedback. Conn an (about) 1Meg resister from the output back to the grid. Choose the resister to give the gain that is required for that stage. This does two things
1) greatly reduces distortion and controls the stage such that it makes not difference at all which brand tube you use. The stage will be linear.
2) Lowers the output impedance of the tube so it can better drive the power tube.

It is a very low cost solution too. About 5 cents of added cost for the resistor. I'd use the "AX" tube because it has the most gain of tube in that series and you need open loop gain if using local NFB.
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Old 11th October 2012, 05:48 AM   #15
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May I recommend a very linear one, with healthy current: The EF80 or the EF184 (frame grid, higher gain) triode connected. That's what I use in my EL34 SE. Since you seem concerned with brands, note that you can find Mullards, Telefunkens etc for very cheap.
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Old 11th October 2012, 06:10 AM   #16
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Thanks for your comments.

Nobody suggested a topology like SRPP or cascode for this drive. Why?
Are they bad or useless?

Then I have planned to test some tube like 12AX7 and 12AT7 and ... and write result as soon as possible.
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Old 11th October 2012, 06:13 AM   #17
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Originally Posted by navidstat View Post
Thanks for your comments.

Nobody suggested a topology like SRPP or cascode for this drive. Why?
Are they bad or useless?

Then I have planned to test some tube like 12AX7 and 12AT7 and ... and write result as soon as possible.
SRPP has too much gain, so if you don't need feedback there is no use for it. t is favored by the Chinese manufacturers for this reason.
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Old 11th October 2012, 09:41 AM   #18
aroS3 is offline aroS3  Greece
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You should also try the 6e5p, triode connected. It's always an excellent driver ...!!!!
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Old 17th December 2012, 08:55 AM   #19
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thanks Costis_n.

find some Ef80 Philips Miniwatt made in Holland.

what schematic is suggestion. can i use it with plate choke?
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Old 17th December 2012, 10:02 AM   #20
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not needed, my schematic has simple resistors only.
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