Ef86 tube replacement

[Whoops]

Never tried or seen thoses ones, I just have experience with JJ tubes

 

[Dark1]

You're right, sorry, I made a confusion with NOS Tesla E88CC that I also need for my Redd47 and there's a version with gold pins. But what about EF806s... Are they worth a try ?

Yes, TESLAs are usually very good esp. these special quality variants. But like all tubes, they need to be selected for mic applications from larger batches…

 

[Moby]

JJ EF806s

Just to share my experience with JJ new production. I placed the order for 10 ECC83's, (Bürklin) just to give a try. I was shocked that just two of them measured 80% emision, other ones were 25-50%! Not to mention that non of them were matched inside (double triode). So, 8 from 10 ended in the trash

 

[alphasnk]

I know, I was talking about NOS TESLA EF806s

I've tried Tesla ef806s, it has a more 'vintage' sound compared to ef86/pf86/ef802, the low end is more 'blooming', i think it would be great on drums!

 

[flashlamp]

I've tried Tesla ef806s, it has a more 'vintage' sound compared to ef86/pf86/ef802, the low end is more 'blooming', i think it would be great on drums!

did national / bel ever make an ef86 , i have a genuine telefunken ef86 made in germany it's from a dynaco amp pull. it has the blue dimond stamp nos. one thing is i need to find it.

 

[alphasnk]

did national / bel ever make an ef86 , i have a genuine telefunken ef86 made in germany it's from a dynaco amp pull. it has the blue dimond stamp nos. one thing is i need to find it.

I'm not sure about National / Bel making ef86, but i got a National ef802, which has no particular sound, it sounds like an amplified signal The most 'exotic' ef86 i have is from Trigon, it sounds pretty ok in a preamp, i havent tried it in a microphone yet!

 

[Whoops]

Just to share my experience with JJ new production. I placed the order for 10 ECC83's, (Bürklin) just to give a try. I was shocked that just two of them measured 80% emision, other ones were 25-50%! Not to mention that non of them were matched inside (double triode). So, 8 from 10 ended in the trash

Hi Bro, I can't talk about the emission measurement, but they're not suppose to be matched.
Banzai sells JJ 12AX7 macthed tubes for a few euros more.
I only buy those and those were always good, there's also the premium version of 12AX7 with Gold Pins.

I never ever had the problems you describe with JJ EF806S, those were always top notch.

best regards

 

[Moby]

Hi Bro, I can't talk about the emission measurement, but they're not suppose to be matched.
Banzai sells JJ 12AX7 macthed tubes for a few euros more.
I only buy those and those were always good, there's also the premium version of 12AX7 with Gold Pins.

I never ever had the problems you describe with JJ EF806S, those were always top notch.

best regards

Hey mate. It's possible that I had a bad luck but the JJ ECC83's were terrible. Not regarding the triodes match but overall, poor emission on both halves.

 

[RuudNL]

I had a lot of problems with the JJ EF806S tubes.
High noise level and intermittent crackling sounds.
Some even had such a high noise level that they were unusable.

 

[soapfoot]

The late Oliver Archut dissected some new production EF806 and ran some tests about fifteen years ago. He was not impressed. Construction details and performance that did not conform to original spec, contaminants inside the tube impacting performance, etc.

See his observations at the links below:

Re: Tung-Sol EF806SG

Re: NewTung-Sol EF806SG Tubes- Any Good?

Have things improved in the last decade and a half? Maybe, but if so I've not seen anyone duplicate these tests and present evidence that this is the case

 

[innercityman]

did national / bel ever make an ef86 , i have a genuine telefunken ef86 made in germany it's from a dynaco amp pull. it has the blue dimond stamp nos. one thing is i need to find it.

I've got a National EF86 which I'm using as a test tube for my Redd47 build

 

[Whoops]

I had a lot of problems with the JJ EF806S tubes.
High noise level and intermittent crackling sounds.
Some even had such a high noise level that they were unusable.

I had exactly the opposite experience with JJ EF806S tubes,
great sounding, no noise, no microphonics and reliable.

 

[ruffrecords]

Just to share my experience with JJ new production. I placed the order for 10 ECC83's, (Bürklin) just to give a try. I was shocked that just two of them measured 80% emision, other ones were 25-50%! Not to mention that non of them were matched inside (double triode). So, 8 from 10 ended in the trash

I have also not been impressed with JJ new production tubes. However, EH and Sovtek I have found to be remarkably good and consistent.

Cheers

Ian

 

[Moby]

I was pinning my hope on JJ production. After my experience I really don't see the bright future in EU vacuum tubes production.

 

[ruffrecords]

I was pinning my hope on JJ production. After my experience I really don't see the bright future in EU vacuum tubes production.

Only the Russians make good tubes these days.

Cheers

Ian

 

[soapfoot]

Has anyone tried the Russian Tung-Sol EF806S?

Oliver Archut's notes on these are linked in post #50 above

 

[rmburrow]

The late Oliver Archut dissected some new production EF806 and ran some tests about fifteen years ago. He was not impressed. Construction details and performance that did not conform to original spec, contaminants inside the tube impacting performance, etc.

See his observations at the links below:

Re: Tung-Sol EF806SG

Re: NewTung-Sol EF806SG Tubes- Any Good?

Have things improved in the last decade and a half? Maybe, but if so I've not seen anyone duplicate these tests and present evidence that this is the case

The late Oliver Archut told me in a phone conversation no one would replicate the AC701 mic tube without taking short cuts which would compromise the integrity and quality compared to a Telefunken AC701.

 

[soapfoot]

The late Oliver Archut told me in a phone conversation no one would replicate the AC701 mic tube without taking short cuts which would compromise the integrity and quality compared to a Telefunken AC701.

Thus far, I don't think he's been proven wrong.

It'd be nice if someone came along who would've surprised him