[rb2013]

You can't do this with the E88CC/6922.

So both sections must be heated - even if only one section is used?

 

[Oskari]

So both sections must be heated - even if only one section is used?

The tube only has two heater pins.

 

[rb2013]

The tube only has two heater pins.

Yes I know - but they both don't have to be heated - just the one for the section used.  The 6922/E88CC is a dual triode. 
In essence two tubes in one glass.
 
The only common pin is #9 the internal shield.
 
So for the adapter could be wired with pins 5,6,7,8,9 for tube 1 and pins 1,2,3,4,9 for tube 2.  Pins 5,6,7,8,9 for Section 1 of the 1st tube and pins 1,2,3,4,9 for Section 2 of the 2nd tube.
 
I can't see any reason it wouldn't work.  The amp heater would only see 2 sections and 2 heater pins - just like in a single tube.
 
 
 

 

[Oskari]

The only common pin is #9 the internal shield.

So for the adapter could be wired with pins 5,6,7,8,9 for tube 1 and pins 1,2,3,4,9 for tube 2.  Pins 5,6,7,8,9 for Section 1 of the 1st tube and pins 1,2,3,4,9 for Section 2 of the 2nd tube.

I can't see any reason it wouldn't work.  The amp heater would only see 2 sections and 2 heater pins - just like in a single tube.

Pin 9 is not connected to the heaters in the ECC88/6DJ8 family. (It is in the ECC83/12AX7 family, for example.)

 

[rb2013]

Pin 9 is not connected to the heaters in the ECC88/6DJ8 family. (It is in the ECC83/12AX7 family, for example.)

That's good. Running a single section from two tubes should be doable then.

 

[Oskari]

That's good. Running a single section from two tubes should be doable then.

It isn't. You need a circuit, 6.3 volts across pins 4 and 5 of each tube.

 

[rb2013]

It isn't. You need a circuit, 6.3 volts across pins 4 and 5 of each tube.

Too bad

 

[thecrow]

No the '70s silver shields are way leaner then the '60's grays.  I would prefer to have the gray shield regular ECC88 (remember the CCa's were just specially select ECC88's).

If you find the silver shields rich enough - then the grays will be perfect for you.  They have a more neutral balance.  So much of this tube matching is system - preference dependent.

The only way to know for sure is to try a few of the best out and see what is optimal for you.

Why we love to tube roll.  I use the HGs in two hybrid integrateds, my HP amp, and  a DAC.  They seem to work everywhere for me.

Apologies if ive already asked this of you (rb) but in having just discovered that the cca's that i have that i do really enjoy are 1966 tubes and not 76 does your experience (or knowledge) have you believe there would be much difference between my '66 A1 silver shields and early 60's (say 63,64,65) A0 gray shields ?

Thanks
Peter

 

[rb2013]

Apologies if ive already asked this of you (rb) but in having just discovered that the cca's that i have that i do really enjoy are 1966 tubes and not 76 does your experience (or knowledge) have you believe there would be much difference between my '66 A1 silver shields and early 60's (say 63,64,65) A0 gray shields ?

Thanks
Peter

Hi Peter - Well I told those '60s gray shields were better then the '70's silver shields.  Now I have not owned every year of the Seimens CCa's  - that would require silly money spent.
 
So I can't say - but please post your findings!
 
If I win Lotto tonight I might look for a pair of the '50s 'U'Getters - they go for close to a grand  - if you can find them..
 
As you you know my absolute favorites are the Uber HGs.  They were the game changer for me - and my tube lust was finally quenched!  That's a great place to be.

 

[thecrow]

Hi Peter - Well I told those '60s gray shields were better then the '70's silver shields.  Now I have not owned every year of the Seimens CCa's  - that would require silly money spent.

So I can't say - but please post your findings!

If I win Lotto tonight I might look for a pair of the '50s 'U'Getters - they go for close to a grand  - if you can find them..

As you you know my absolute favorites are the Uber HGs.  They were the game changer for me - and my tube lust was finally quenched!  That's a great place to be.

Thanks heaps for all the info.

I'll mull it over before i decide whether to go tele e188cc (have never heard a tele) or grab a gray cca to pair with my silver. In that process i'll probably read your comparison on page 1 another dozen times again

I lean to the cca's from your reviews but do i already have that 95% covered with my silvers? We shall see

 

[rb2013]

Thanks heaps for all the info.

I'll mull it over before i decide whether to go tele e188cc (have never heard a tele) or grab a gray cca to pair with my silver. In that process i'll probably read your comparison on page 1 another dozen times again

I lean to the cca's from your reviews but do i already have that 95% covered with my silvers? We shall see

Please post your impressions either way. 
 
Cheers

 

[eschell27]

Crow, have you ever heard the '74 or '75 Reflektors?
I'm using some '75s in my WA2 with TS5998 and Brimar EZ80...been a wonderful combo so far.

 

[thecrow]

Crow, have you ever heard the '74 or '75 Reflektors?
I'm using some '75s in my WA2 with TS5998 and Brimar EZ80...been a wonderful combo so far.

No

Last time i asked Bob about them hw was limited in what he had and im wary of these sellers on ebay of them from what ive heard so i feel ive missed the boat

 

[rb2013]

No

Last time i asked Bob about them hw was limited in what he had and im wary of these sellers on ebay of them from what ive heard so i feel ive missed the boat

Really wish Brent Jesse or Tube World  - even Upsacle would find a pallet of NOS '75 HGs and sell them.  The one seller on Ebay 'Jetparts' is fairly reliable on his tube testing - but does not screen for noise or microphonics.  So it's a bit of a $200/pr 'Russian Roulette" there.

 

[eschell27]

I'm with you...in all honesty i'd have no reservations at all paying $200/pair if i KNEW they were going to be quality tubes.