[MDR30]

Quote:

No, I haven't had the Jade in a long time.

 
Would be interesting to know how you would compare it to other present day OTL designs, if your aural memory allows. I find it very transparent and persuasive, bringing out certain qualities in recordings that elude other amps.
 
Just put in a Hewlett and Packard output tube (manufactured by RCA) that sounds great.
 
Are there other designs of this simplicity with cathode and plate outputs and so few components available?
 

 

[MDR30]

Am now preparing a balanced connection with my K400 and K500 headphones. Takes some thinking with double TRS plugs.

12BH7 driver tube also works well, just tried a Sylvania NOS from 1961. Sounds very warm and enveloping, can recommend it. No hiss and buzz like there was to a smaller degree (volume pot) with a RCA 12BZ7.

Next stop: a vintage GEC 6AS7G arriving from Australia.

 

[MDR30]

Does anyone know if the 12AX7 runs on 6,3 or 12,6 V filament?

 

[Skylab]

The "12" in 12AX7 provides your answer

 

[MDR30]

The "12" in 12AX7 provides your answer

That's right, but the 12AX7 can also be driven with 6,3V using an alternative connection. Since the Jade's 6AS7G use 6,3V filament, I suspect the transformer delivers that voltage.

It would decide if I can use a 6SL7 or a12SL7 as alternative driver tube with adapter.

 

[JoeLau]

Thank for support very much. I'm busy in these years due to factory join venture  with European company.  I had no time to take care headphone amp sales. I even lost my old account information.  You can contact me by  13809830091@139.com.  I wil redesign Jade soon. It willl have a 42 steps relay base steps attenuator, more better sound, with remote.....

 

[Fizz]

  Thank for support very much. I'm busy in these years due to factory join venture  with European company.  I had no time to take care headphone amp sales. I even lost my old account information.  You can contact me by  13809830091@139.com.  I wil redesign Jade soon. It willl have a 42 steps relay base steps attenuator, more better sound, with remote.....

Interesting

 

[elwappo99]

  Thank for support very much. I'm busy in these years due to factory join venture  with European company.  I had no time to take care headphone amp sales. I even lost my old account information.  You can contact me by  13809830091@139.com.  I wil redesign Jade soon. It willl have a 42 steps relay base steps attenuator, more better sound, with remote.....

 
Great to hear from you! Excited to see what you come up with next!

 

[MDR30]

That's right, but the 12AX7 can also be driven with 6,3V using an alternative connection. Since the Jade's 6AS7G use 6,3V filament, I suspect the transformer delivers that voltage.

It would decide if I can use a 6SL7 or a12SL7 as alternative driver tube with adapter.

 
 
I checked and measured and the 12AX7 filament is 6,3 V. So I got a 6SL7 adapter (6,3 V, from lowther_club Hong Kong) and had some very nice sounds coming from a Tung Sol 6SL7 and a GEC 6AS7G. Will send pics later.

 

[MDR30]

Listened to some classic stereo tracks, sounds terrific. Here's a photo:
 

 

[MDR30]

A Full Sound 6SL7 to the right, with adapter for 6.3 V filament 12AX7. Sounds as good as it looks, among the very best I've heard in this combination.
 

 

[MDR30]

Thank for support very much. I'm busy in these years due to factory join venture  with European company.  I had no time to take care headphone amp sales. I even lost my old account information.  You can contact me by  13809830091@139.com.  I wil redesign Jade soon. It willl have a 42 steps relay base steps attenuator, more better sound, with remote.....

Good to know you're still in business. I've been enjoying my Audiotailor Jade thoroughly, and it's very gratifying rolling tubes.

The amp was designed for the 6AS7 and 12AX7, drawing 2,5 and 0,3 A respectively. Is it safe to replace the 12AX7 with the 12BZ7 which draws 0,6 A? Want to make sure it is within the limits of the mains transformer. I've used it frequently without any problems and it's quite powerful.

 

[Hz_joe]

It is no problem to use driver tube with 600ma.  Driver Filament section of Jade can up to 800ma without problem.

 

[elwappo99]

  It is no problem to use driver tube with 600ma.  Driver Filament section of Jade can up to 800ma without problem.

 
Hey you got your account back! Can't wait to hear new things from you! 

 

[MDR30]

This amp is a strange animal!

Did some tube rolling with newly acquired 6L7s (1954 Melz and smoked RCA, as well as Mullard E180CC and others) and those magic spatial qualities were absent.

Turned out I had a different AKG (K401) connected to the second output (right), with my favourite K500 in the left. Changed to two K500s and that made all the difference - symmetrical load!

Another reminder that I really should make a double-plug mod for balanced drive of my K500 as described by Joe early in this thread (he also supplied a cable like that for the 600/650 Sennheisers as well).