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OLDER DECWARE GEAR SUPPORT >> TORII MK III >> Input Tube Question
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Message started by krell on 08/07/11 at 14:39:59

Title: Input Tube Question
Post by krell on 08/07/11 at 14:39:59

Can a E188CC (7308) be substituted for the 6N1P or 6922 on a Zen Torii with no ill effects?
Thanks in advance.

Title: Re: Input Tube Question
Post by will on 08/07/11 at 16:30:36

I believe the 7308 is basically a very high quality member of 6DJ8/6922 family. Same 6.3v heater voltage, and similar current specs. Here is a writeup on the family.

http://www.audiotubes.com/6dj8.htm

I have never used one in the Torii myself though, so can't say for sure.

Title: Re: Input Tube Question
Post by Pale Rider on 08/07/11 at 18:52:44

Haven't used one either, but looks like it ought to be a superb choice. Do you have them, or are you thinking about buying some?

Title: Re: Input Tube Question
Post by krell on 08/07/11 at 23:36:35

I have some that i bought in the 80's for a preamp i no longer have.

Title: Re: Input Tube Question
Post by will on 08/08/11 at 00:03:30

Hey Krell,

Have you listened to them yet?

Here is another link with interesting info on them.

https://www.tubeworld.com/index_high.htm

Look down the list on the right toward the bottom and glance through the explanations and reviews. It sounds like they could be mighty tubes!!!

Title: Re: Input Tube Question
Post by Pale Rider on 12/19/11 at 00:37:03

I have a set of Amperex PQ 7308 tubes on order to try as input tubes for the Toriis. First, I am putting some Siemens Halske E88CC tubes in the Ultra, and then plan to try the Amperex.

Title: Re: Input Tube Question
Post by GTort on 03/09/12 at 04:49:40

I have recently rolled two Amperex JAN 7308 inputs for the stock 6N1P and am liking the results. Have about 30 hours on them and find them a definite upgrade to the upper-mids and highs. I don't know if these are the final answer as I have a number of other tubes on order but these are staying in for a while.
So far I found a larger improvement going from stock 5U4G rectifiers to SED Winged "C" 5U4G. just more tonal balance noticed instantly throughout the spectrum and a little more bass. I have other rectifiers to try but these will be tough to beat.

No ill effects as I wouldn't expect.

Title: Re: Input Tube Question
Post by tgarden on 03/10/12 at 02:16:25

I used Amperex USN 7308's in my original Torii, Torii II, and currently in my Z-capped Torii III.

Very long-lasting tubes (10,000 hours?), plenty of gain in my system, and I'm quite happy with the sound. Try to find a pair with closely matched triodes before you spend the dollars. US Navy or not, the measurements on the ones I have seen, can vary quite a bit.

I wore out a pair of 1965 Amperex Holland made 7308 PQ's in my Torii I and Torii II, and found those to be very fine sounding tubes also. The Dutch ones are tougher to find than the 1964-65 USN versions and more expensive. As I remenber, the sonic differences were slight.

As always, your experience may vary.