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Dubstep Girl's Massive 5AR4/5R4/5U4G Rectifier Review/Comparison! (Rectifer Tube Rolling thread)
Jul 23, 2022 at 7:20 PM Post #2,236 of 2,674
jbua5150 said:
When testing the USAF596 on an Amplitrex AT1000, do you use the 596-5U4G adapter and test as 5U4G?
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I would think you need one for each of the top pins, or does the Amplitrex have them built-in?
 
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Jul 23, 2022 at 9:23 PM Post #2,237 of 2,674
ColSaulTigh said:
I works think you need one for the top pins, or does the Amplitrex have them built-in?
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Both tube testers I’ve used Amplitrex AT1000 and B&K 707 only have one port for an external grid wire. I’m not sure how one would attach leads to both top pins of the 596.
Seems like the 596-5U4G adapter would HAVE to be used?
 
Jul 24, 2022 at 3:58 AM Post #2,238 of 2,674
Jul 25, 2022 at 12:43 AM Post #2,239 of 2,674
No one has experience testing the USAF-596, to help shed some light the how to properly test one?
 
Jul 25, 2022 at 9:25 PM Post #2,241 of 2,674
gibosi said:
While I don't own a tube tester, I feel fairly certain that you could mount it in a 596 to 5U4 adapter and test it as a 5U4GB. This should get you pretty close. :)

Good luck!
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This is what I'll have to do. I think the 596 I just purchased may be quite used.
I notice a slight "haze" in the glass that my other 596 doesn't have. I don't install untested tubes.
I hope to test it on Wednesday, a local shop has an Amplitrex and lets me rent time on it. Fingers crossed :)
 
Jul 25, 2022 at 10:05 PM Post #2,242 of 2,674
jbua5150 said:
This is what I'll have to do. I think the 596 I just purchased may be quite used.
I notice a slight "haze" in the glass that my other 596 doesn't have. I don't install untested tubes.
I hope to test it on Wednesday, a local shop has an Amplitrex and lets me rent time on it. Fingers crossed :)
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Yes, that is the best and only way to test it on an Amplitrex(some type of adapter). The percentages will likely be off due to them being related to expected values for 5U4G, but you can always take your known-good 596 and compare numbers between the two.
 
Jul 26, 2022 at 12:35 AM Post #2,243 of 2,674
Is this Mullard 5AR4 still one of the best NOS models to buy?

https://tubedepot.com/products/5ar4-gz34-mullard-philips

$300 USD per tube is pretty high but if it's worth it and lasts a very long time then I'd be willing to give it a shot. Has to be better than my current bog-standard Sovtek.
 
Jul 27, 2022 at 12:12 PM Post #2,244 of 2,674
Gazza said:
Is this Mullard 5AR4 still one of the best NOS models to buy?

https://tubedepot.com/products/5ar4-gz34-mullard-philips

$300 USD per tube is pretty high but if it's worth it and lasts a very long time then I'd be willing to give it a shot. Has to be better than my current bog-standard Sovtek.
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That's a Mullard 4 notch. Great rectifier and they typically last a very long time. I think $300 is a little high. I bought one not too long ago on Ebay for $125. They might not be up there every day, but often enough to snag one. The 7 notch is just as good if you find one of those. Honestly, the JJ GZ34/5AR4 is pretty good sound-wise, IMO, but many people say that durability is lacking. I only have one of them and it's been fine so far, but I probably only have a few hundred hours on it.
 
Jul 27, 2022 at 8:25 PM Post #2,245 of 2,674
WillieB said:
That's a Mullard 4 notch. Great rectifier and they typically last a very long time. I think $300 is a little high. I bought one not too long ago on Ebay for $125. They might not be up there every day, but often enough to snag one. The 7 notch is just as good if you find one of those. Honestly, the JJ GZ34/5AR4 is pretty good sound-wise, IMO, but many people say that durability is lacking. I only have one of them and it's been fine so far, but I probably only have a few hundred hours on it.
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Thanks for the info. I found this pair on eBay, 7 notch:

https://www.ebay.com/itm/115467728758?hash=item1ae269b776:g:sT4AAOSw8h9i1NEy

A good deal cheaper ($345USD a pair vs $600USD a pair for the previous ones I posted). Seem to be well specced.

Thinking of grabbing these RCA 5691 red plates at the same time:

https://www.ebay.com/itm/225092612376?hash=item346890b118:g:AXAAAOSwyd9iV1aL

I'll be matching them with the new WE 300B that I'll also be ordering.

All I need now is a good pair of 0D3 but it's hard working out which make is best. It seems the regulator tubes don't make much difference to the sound from what I've read.
 
Jul 28, 2022 at 8:50 AM Post #2,246 of 2,674
Gazza said:
Thanks for the info. I found this pair on eBay, 7 notch:

https://www.ebay.com/itm/115467728758?hash=item1ae269b776:g:sT4AAOSw8h9i1NEy

A good deal cheaper ($345USD a pair vs $600USD a pair for the previous ones I posted). Seem to be well specced.

Thinking of grabbing these RCA 5691 red plates at the same time:

https://www.ebay.com/itm/225092612376?hash=item346890b118:g:AXAAAOSwyd9iV1aL

I'll be matching them with the new WE 300B that I'll also be ordering.

All I need now is a good pair of 0D3 but it's hard working out which make is best. It seems the regulator tubes don't make much difference to the sound from what I've read.
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Which 300B amp do you have? I have been weighing options between a new custom OTL, or a 300B amp.
 
Jul 28, 2022 at 7:16 PM Post #2,247 of 2,674
Aug 3, 2022 at 8:32 PM Post #2,249 of 2,674
If anyone needs a single 5U4G, there's one of my favorites - KR Audio 5U4G Riccardo Kron Anniversary Edition - up HERE.
 
Aug 4, 2022 at 12:50 AM Post #2,250 of 2,674
gibosi said:
While I don't own a tube tester, I feel fairly certain that you could mount it in a 596 to 5U4 adapter and test it as a 5U4GB. This should get you pretty close. :)

Good luck!
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Thanks again for the heads up on the 596!
I got to test it Monday, and it tested slightly higher than the 596 that I have already.
I know it’s purely luck (and silly) but the graphics on the base of this tube is much more visible on my adapter! :)
 

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