[JKDJedi]

Burning in the Psvane UK-6SN7 this weekend

Beautiful tube, very nice.

 

[JKDJedi]

Marconi 7AF7 (Related to the7N7 ?)

 

[bcowen]

Marconi 7AF7 (Related to the7N7 ?)

It's a FrankenJr.

 

[Slade01]

Marconi 7AF7 (Related to the7N7 ?)

Round Plates Magic!

 

[JKDJedi]

Peek A Boo .. .

 

[bcowen]

Peek A Boo .. .

My, what big, um, signal tubes you have there, grandma!

 

[Mr BubbaHyde]

Beautiful tube, very nice.

Very curious about the sound of these tubes. So I will lurk in the shadows, learning everyday...Bwaaahahaha

 

[therremans]

Shunted 50k ALPS

I installed the 50k alps blue pot today and used two 47k resistors (see image) to create a shunted pot. What a difference it made in the noise floor! The background is dead silent at 0% until about 90% and 90% to 100%, I can then start to make out an audible background noise. I recommend the shunt for anyone who has or wants to install a new pot in their Darkvoice. It's an easy thing to do with some prototyping board. If the background noise does not bother you, then it's not really worth it. I can easily swap out to a different resistor if I needed to, but the 47k seems to do the job.

(I didn't draw this diagram, thank you who did)

Prototyping board I cut with a ground rail at the bottom:

Underside of the PCB:

All wired up:


Next week, i'm going to replace the stock RCA input jacks and delete the output all together, a higher quality power switch by Carling and a Switchcraft 1/4" jack. I will run new wire while i'm at it.

 

[bcowen]

Shunted 50k ALPS

I installed the 50k alps blue pot today and used two 47k resistors (see image) to create a shunted pot. What a difference it made in the noise floor! The background is dead silent at 0% until about 90% and 90% to 100%, I can then start to make out an audible background noise. I recommend the shunt for anyone who has or wants to install a new pot in their Darkvoice. It's an easy thing to do with some prototyping board. If the background noise does not bother you, then it's not really worth it. I can easily swap out to a different resistor if I needed to, but the 47k seems to do the job.


(I didn't draw this diagram, thank you who did)

Prototyping board I cut with a ground rail at the bottom:

Underside of the PCB:

All wired up:


Next week, I am going to replace the stock RCA input jacks and delete the output all together, a higher quality power switch by Carling and a Switchcraft 1/4" jack. I will run new wire while I am at it.

GREAT info. Thanks! Two questions if you don't mind:

1) With this arrangement and the 50k pot, are you still (roughly) in the middle of the pot's rotation for most listening?
2) Is the 50k pot an audio taper or log taper?

 

[therremans]

GREAT info. Thanks! Two questions if you don't mind:

1) With this arrangement and the 50k pot, are you still (roughly) in the middle of the pot's rotation for most listening?
2) Is the 50k pot an audio taper or log taper?

1) Yes, that hasn't changed much, although a slight db drop did occur due to the resistors.
The total sweep is like this:
Zero = Noon
Max = 10:00
I’m at max listening level with the 5998 at 5:00 to 6:00, 7as7/6080 at 8:00-9:00. Depending on the track. note: my setup always has a total db drop of 6.1 for safe headroom.
2) Taper, I used this one.

 

[bcowen]

1) Yes, that hasn't changed much, although a slight db drop did occur.
The total sweep is like this:
Zero = Noon
Max = 10:00
I’m at full listening level with the 5998 at 5:00 to 6:00, 7as7/6080 at 8:00. Depending on the track. note: my setup always has a total db drop of 6.1 for safe headroom.
2) Taper, I used this one.

Excellent. Thanks!

 

[SHIMACM]

Has anyone tried the GEC A2293 on Darkvoice?

 

[JKDJedi]

Has anyone tried the GEC A2293 on Darkvoice?

I think that's the military stamp for the GEC 6AS7G, I've rolled the latter.

 

[SHIMACM]

I say this tube here, with adapters.

 

[JKDJedi]

I say this tube here, with adapters.

Yes I did, didn't work out as I thought it would, and am not sure if these are drivers or power tubes, I tried using them as power tubes with a dual adapter from Deyan, didn't work out, only one channel worked. both tubes were good just that (it seems like) the power output on the Darkvoice doesn't like dual setups for some reason, that or these were driver tubes this whole time!