[kwatch]

Deleted.

 

[bl4scott]

Picked up a Raytheon JAN-CRP-6SN7GT / VT-231 [U.S. Navy] and trying to figure out what what year equals = FE4? Any ideas folks?

 

[Old Deaf Donkey]

Picked up a Raytheon JAN-CRP-6SN7GT / VT-231 [U.S. Navy] and trying to figure out what what year equals = FE4? Any ideas folks?

In the 1940, year was often still marked by a single digit. Given the VT231 designation, most likely 1944. And FE? I do not know, but FEbruary would be an easy guess?

 

[kwatch]

Does anyone know what type of tube this is?

 

[Old Deaf Donkey]

More pics? ECC 803 perhaps? Not sure

 

[kwatch]

More pics? ECC 803 perhaps? Not sure

It looks like Telefunken ECC83 12AX7.

Code Pair Telefunken ECC83 12AX7 Test NOS/Balanced Long Grey Serious Tubes M645 | eBay

 

[Old Deaf Donkey]

It looks like Telefunken ECC83 12AX7.

Code Pair Telefunken ECC83 12AX7 Test NOS/Balanced Long Grey Serious Tubes M645 | eBay

Fair enough. Why asking, then?

 

[kwatch]

Fair enough. Why asking, then?

I found out after your posting. Can I use this tube in Vali 2+ using the ECC83 12AX7 to 6N2 6N1 6N6 Tube Socket Adapter Converter? What will happen if it is not ECC83 and used in Vali 2+ using the converter?

 

[Old Deaf Donkey]

I found out after your posting. Can I use this tube in Vali 2+ using the ECC83 12AX7 to 6N2 6N1 6N6 Tube Socket Adapter Converter? What will happen if it is not ECC83 and used in Vali 2+ using the converter?

I would not stick a tube in an amp before knowing its heater voltage and pin out at least. 12AX7 requires a dedicated adapter for Vali 2 as it has twin heater voltage design and it needs to be correctly pinned out for 6.3 V

 

[krunchcrispy]

I'm running it on a socket saver right now, but I will give it a shot later without the socketsaver to see if it will work - dunno if the pins are quite long enough. EDIT: Not long enough pins to run without a socket saver.

I tried a grey glass RCA CRC 6SN7-GT first. I am not sure if that one is NOS or not, but so far all of the tubes from that haul have been. It was quite good, but then I put in a silver top Sylvania 6SN7 GTB, and I can't put my finger on the differences quite yet, but I do prefer the silver top Sylvania - at least right now. Gotta let both burn in for awhile tho.

HEy, I have enjoyed reading your impressions. I recently got the Vali 2+ and wondering what kind of tubes to get. If you have the time could you update your thoughts on your favorite tubes?

 

[emorrison33]

Question. Making up numbers here for the most part....The Vali2 frequency range is 20Hz to 20Khz. And let's say my headphones are 9Hz to 30Khz. Am I effectively "cutting off" those frequencies by using my Vali 2 headphone amp? Losing the full range of my headphones? I realize, for the most part us humans can only hear between 20Hz and 20Khz.....just wondering is all.

 

[timb5881]

Question. Making up numbers here for the most part....The Vali2 frequency range is 20Hz to 20Khz. And let's say my headphones are 9Hz to 30Khz. Am I effectively "cutting off" those frequencies by using my Vali 2 headphone amp? Losing the full range of my headphones? I realize, for the most part us humans can only hear between 20Hz and 20Khz.....just wondering is all.

No,the 20-20k is what the specs say, but there is a roll off at each end. It has a +- of 0.06 db so the roll off is small.

 

[bcowen]

Question. Making up numbers here for the most part....The Vali2 frequency range is 20Hz to 20Khz. And let's say my headphones are 9Hz to 30Khz. Am I effectively "cutting off" those frequencies by using my Vali 2 headphone amp? Losing the full range of my headphones? I realize, for the most part us humans can only hear between 20Hz and 20Khz.....just wondering is all.

If a tree falls in the woods....

 

[Ripper2860]

If a tree falls in the woods....

Then we are all the lesser for it.

 

[JoeKickass]

Question. Making up numbers here for the most part....The Vali2 frequency range is 20Hz to 20Khz. And let's say my headphones are 9Hz to 30Khz. Am I effectively "cutting off" those frequencies by using my Vali 2 headphone amp? Losing the full range of my headphones? I realize, for the most part us humans can only hear between 20Hz and 20Khz.....just wondering is all.

I've always found it funny how much the headphones stretch the frequency response spec, even though they are by far the least linear component in a system.

Even though you say you are making up numbers, there are plenty of headphones which stretch them farther, Sennhieser specs the frequency response of the HD 800S all the way down at -10dB!

In the human range of 20-20khz you typically get frequency response variations of <0.1 db from a DAC or amplifier, so 10 dB is huge.
IMO it would be nice if the headphone makers gave you the max deviation within our actual hearing range.