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WTB  7DJ8 pair (Read 2309 times)
Greg12
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WTB  7DJ8 pair
12/25/13 at 20:59:07
 
For my Torii MK3 i'm running the stock Tung-sol el34's, OB3 and stock OC2's.  
Edit: My rectifiers are RCA  5u4gb's.  I also have Rca 5y3gt and Philips 5R4GYS on hand.
I currently am using as inputs the Matsushita / National PCC88 / 7DJ8 from Upscale Audio.  I like them a lot.  Would like to experiment w/ some other 7dj8's that those with experience would think would be an improvement.  Would love to hear some Telefunkens and the like but w/ Xmas here I'm tapped out for new ones.

I have about $67 in my paypal account to play with.  Now I know it ain't much $, and as far as I know I'm nobody's first cousin here.   Grin  But... if you have some used fancy pants 7dj8's that you've moved on from but still have decent life left in them and you think would improve on the Nationals, I'd be interested.  

Edit: Just thinking, I've got a nice Philips 5R4GYS Made in Holland  rectifier w/ less than 300hrs on it I could add to the $.  Since I sold my CSP2 not too long ago, I don't need it anymore.  It came from Upscale Audio. They go for $55 there now.

Thanks,

Greg
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« Last Edit: 12/26/13 at 19:56:28 by Greg12 »  

Torii MkIII, DM947 speakers, Oppo 105
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will
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Re: WTB  7DJ8 pair
Reply #1 - 12/26/13 at 01:07:07
 
Hey Greg. What Rectifiers are you liking/using in your Torii? Since you like the National 7DJ8, what direction would your imagination take you for better sound. Like all the tube types, I hear a 7DJ8 "sound" but within that, I think there is enough variation to make your interest in other 7DJ8s real (I have a lot of them!). Would you like more open and big, more transparent, more dark or bassy. cleaner/tighter, more textured ..... If you let me know I might be able to point you somewhere.
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Rivieraranch
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Re: WTB  7DJ8 pair
Reply #2 - 12/26/13 at 12:27:35
 
I'm preparing to try some yellow label Tesla PCC88's in my TABOO MK III, TORII MK IV and ZEN CKC. What are they like in these applications?
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pann56
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Re: WTB  7DJ8 pair
Reply #3 - 12/26/13 at 13:43:53
 
i have a Matsushita 7DJ8 tube from Upscale .  Can that be used in the driver (front) position in my CSP3 preamp ? Undecided
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Greg12
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Re: WTB  7DJ8 pair
Reply #4 - 12/26/13 at 13:51:07
 
Hi Will.   Sorry I forgot to include the rect's I'm using.  Rca 5y3gt and just recently rca 5u4gb's.

The current sound I'm getting is really great, but if it can be improved on then I'll spend for it.   What I'm getting now is a very natural sound. Texture, transparency,  spot on warmth and accurate bass/treble is what i want.  I'm really satisfied with those attributes now, i could live with it and be happy.  But curiosity has me wondering if there is still room for improvement in the listed departments.

I'm currently focussing in the input tubes because i think I've got what is for me, the right rect's and drivers.  I tried the G.L. kt77's and Orangecrush was right in his description elsewhere on this site.  An exciting sound in the mids and treble, really lively in the best sense.  It's just that they really seemed to put out too much bass for my room and spkrs to handle accurately.   (DM945's with the new companion cabinets) .  The bass was bloated and flabby .   If my paradigm studio 80s were working it would have been cool to see how they handled the bass.  They are impressive in that department.    So I went back to the tung-sol el34s the bass is back to where i like it.  Deep, textured and at the right level.  I have a nice balanced sound.  

So long story short, I want what I've got now only better if it's possible.

Greg
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« Last Edit: 12/26/13 at 19:52:04 by Greg12 »  

Torii MkIII, DM947 speakers, Oppo 105
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Lord Soth
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Re: WTB  7DJ8 pair
Reply #5 - 12/26/13 at 13:53:01
 
Hi Pan56,

Yes the 7DJ8 tube can be used in either the 1x input position or the 2x L/R output position.
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Lon
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Re: WTB  7DJ8 pair
Reply #6 - 12/26/13 at 13:56:14
 
Greg, have you tried any OB3 or OC3 with the KT66? In my rig these both diminish bass output considerably and diminish what Will rightly calls "the push." May be just the right compromise.

Though. . .every time I try a tube in the Mk III that doesn't engage the Hazen Grid mod, I just feel something is not quite all it can be.
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pann56
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Re: WTB  7DJ8 pair
Reply #7 - 12/26/13 at 14:42:17
 
Thanks Lord Soth.  Gonna check it out.  Also using the Philipps rectifier tube.
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Greg12
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Re: WTB  7DJ8 pair
Reply #8 - 12/26/13 at 16:21:20
 
Well I just sold the Philips rectifier so that's off the table.  On the other hand,  I now have a few extra bucks in the Paypal acct so can pay more if needed for input tubes.

Greg
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Greg12
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Re: WTB  7DJ8 pair
Reply #9 - 12/26/13 at 16:40:16
 
Hey Lon,

I'm with you on the Haazen Grid, It's very seductive and I don't wanna stray from it.

Greg
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will
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Re: WTB  7DJ8 pair
Reply #10 - 12/26/13 at 16:54:49
 
Lon, I am guessing you mean to try a OB3 or OC3 with Greg's KT77s? I think he is using OB3 and I agree, OC3 could be another good option that might bring out the KT77s with less bass. I have some sweet sounding Hytron OD3s. From the 40s better, but from the fifties very good. I find both to chill the push and bass nicely, but with a very natural and balanced sound. I almost always use OB3 with my MkIII in this room, but I have done a lot to calm the bass with treatment and EQ. Without that, I would likely be using OD3s.

Also Greg, I guess you tried the 5Y3GTs with the KT77s? I find that generally 5U4GBs have the deepest bass, 5U4G-STs a bit less, and 5Y3s the least.

I will get back on PCC88/7DJ8s. They are getting harder to find. For me, in a general way, I have liked the Nationals and Telefunkens the least, but can see how they might be just right with the right tubes to compliment them. I will do a little listening.

RR,

I have not tried the Teslas, but from my experience with their 60's ECC88/6922s, I suspect they will have a biggish open sound with good micro detail and delineation.

Pann,

I don't know why LS's CSP3 is so flexible output tube wise, but mine was not. It did well with different tubes in the input position, but was very sketchy in the output pair position...I think so much that it was frying tubes....can't say this for sure, but I did lose one of a pair several times after the CSP3 attempts. Mine is #3, is that before your LS? Maybe, mine just had a bad resister or something....

I sent it back in for a mod that I think Steve may have integrated into later builds to give more output tube flexibility.

Anyway though, I agree...try the 7DJ8 up front. It will be really nice I suspect. Open the sound up a bit and refine detail.
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Greg12
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Re: WTB  7DJ8 pair
Reply #11 - 12/26/13 at 17:30:58
 
Will,

You are correct in that I did use the 5y3gt's w/ the kt77's. I didn't try them w/ the OD3's tho.  May try that.

Greg
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Lord Soth
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Re: WTB  7DJ8 pair
Reply #12 - 12/26/13 at 20:57:23
 
Dear Greg,

First of all, I apologise for derailing your WTB thread!

I hope you get what u are looking for.


Hi Will,

My CSP3 was built much later than yours.
It was still WIP during this year's Decfest.
The guests attending Decfest probably probed and prodded my CSP3  which was lying on the workbench, hence it gained the "Mida's touch". Wink

But seriously speaking, I have been in contact with another CSP3 owner, CKC.
He had some problems with hum and also with using other tubes in the Output section of the CSP3.
He informed me that his CSP3 was sent back and Steve D. made some internal changes such that the CSP3 could now accommodate other output tubes.

Maybe Steve D made some progressive production changes to the layout of the CSP3, much like what he recently did with the Mystery amp?

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Greg12
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Re: WTB  7DJ8 pair
Reply #13 - 12/26/13 at 21:28:19
 
No problem Lord Soth,  just sell me a couple of your Lorenz PCC88 tubes for $67 and we'll be all square.   Wink
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« Last Edit: 12/26/13 at 21:42:40 by Greg12 »  

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will
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Re: WTB  7DJ8 pair
Reply #14 - 12/26/13 at 22:47:48
 
LS,

I would not doubt if yours has the mod I am getting.

Greg,

So hard to say with different system/rooms, but with the tubes I have in now, and here, I feel like the Nationals sound great with some stuff, and sort of unnatural with other stuff, in which case they can be a bit forward/edgy in the mids/upper mids but with really good texture. And at times they feel a bit restrained and unresolved in the low mids down. They go nice and low, they just feel a little sluggish there at times, but this may be in part in contrast with the up front mids.

If you want to stay big and open, I think the below are similar and almost exactly in your price area....To my ear, generally more natural in balance and tone. Smoother, but still clear mids and upper mids, and still big bass. In my room, perhaps a little better developed bass definition. They might be a good one to try...like the Nationals in a broad sense, but different enough to explore.

http://www.ebay.com/itm/NOS-Zaerix-PCC88-7DJ8-tubes-Matched-Pair-Brand-new-in-bo...

They look Russian made with great range and balance and look just like mine. I bought them from the same seller a while ago, so likely the same tube.

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« Last Edit: 12/27/13 at 01:23:30 by will »  

Mac mini, Tranquility DAC, CSP3, TORII MkIV, Morrow SP-6, HR-1s...VHaudio DIY, Grover, MAC ICs...PSAudio P5 and Shunyata Defender, PI Audio and DIY power cables, HerbiesAudioLab isocups and tube dampers...
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