[Xcalibur255]

   
Can I assume that by looking at the datasheet, it is possible to determine the voltage drop of a particular rectifier?

I have a chart saved somewhere I think.  Let me see if I can find it......

 

[Xcalibur255]

Found it.
 

 
Vdrop is your voltage drop.  This is the drop at maximum current rating, the drop is less when the tube is under a less severe load.  Some data sheets will actually show you a graph showing the voltage drop change as the load increases, but I've only seen this on a couple of them.  Wish they all did it, then we could calculate exactly how much plate voltage we were getting for any tube assuming the the circuit values for the amp were known.

 

[Xcalibur255]

You can see why the 5AR4 tends to make amps sound more lively and dynamic, it has about the least drop of any 5V rectifier.  The 5R4GY seems to have the most, and is effective for mellowing an amp out.

 

[2359glenn]

  You can see why the 5AR4 tends to make amps sound more lively and dynamic, it has about the least drop of any 5V rectifier.  The 5R4GY seems to have the most, and is effective for mellowing an amp out.

if that is totally true a SS rectifier should sound best.

 

[gibosi]

  Found it.

 
Thank you! This is a very useful chart to have. But I want more! lol
 
Do you happen to know what the vdrop is for the GZ32, 33, and 37?

 

[Neogeo333]

 
if that is totally true a SS rectifier should sound best.

http://www.webervst.com/ccap.html
 
I've beem using the WZ68 for quite some time.  Sounds fast and detailed.  Cheap also if you need the huge current and low vdrop.  

 

[MoatsArt]

What a wonderful sounding device.  Just to clarify, you have the choice of plug and play, or hard wiring.

 

[Xcalibur255]

 
if that is totally true a SS rectifier should sound best.

 
I'm discounting the effects of switching noise of course.  But I think the general relationship of less Vdrop = faster sounding generally holds true in most amps wouldn't you say?

 

[Xcalibur255]

   
Thank you! This is a very useful chart to have. But I want more! lol
 
Do you happen to know what the vdrop is for the GZ32, 33, and 37?

 
I can't recall off hand.  I used to know.  It's on the lower side of things, closer to a 5AR4 than a 5U4G.  The GZ33 has a bit less drop than the GZ37 does.  I can't remember where the GZ32 falls.

 

[gibosi]

   
I can't recall off hand.  I used to know.  It's on the lower side of things, closer to a 5AR4 than a 5U4G.  The GZ33 has a bit less drop than the GZ37 does.  I can't remember where the GZ32 falls.

 
Looking at the datasheets for the GZ33 and GZ37, Vout seems to indicate that the GZ33 has less drop than the GZ37, but of course, without knowing Vdrop, I wasn't able to compare it to the rectifiers on the chart. But again, thanks!

 

[gibosi]

Currently on eBay, listing #311134071038, there is a Tungsram 6F8G. Is this likely a rebrand? Or do we know that Tungsram made these tubes?

 

[Badas]

  Currently on eBay, listing #311134071038, there is a Tungsram 6F8G. Is this likely a rebrand? Or do we know that Tungsram made these tubes?

It looks unique. I haven't seen that plate structure.

 

[Fatsosixsixsix]

Bought a pair of NU 6NS7, one of which has a crack in the base but is apparently still still air tight. Is this cause for concern?

 

[rosgr63]

As long as the base is tight there's nothing to worry about.
That's provided the tubes has been tested.

 

[Fatsosixsixsix]

The base is tight and the seller claims to have tested, I don't own my own tester so I can't verify it however.