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Conrad-Johnson It just sounds right

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  #41 (permalink)  
Old 01-20-2012, 09:21 AM
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Originally Posted by Joe Appierto View Post
I had gotten mine at Tubemonger but they don't seem to have any more currently. Here's a link to them in their photo gallery:
Lorenz Stuttgart PCC88 Gray Shield 1960s OEM NO LABEL Getter Ring Fused with Splatter Shield Construction - Made in Germany

I believe the earlier Lorenz tubes before they were labelled SEL and then ICI are the most desirable.
Yea, I noticed that on my google searches. Looks like you cleaned them out Joe
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Old 01-20-2012, 02:55 PM
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Yea, I noticed that on my google searches. Looks like you cleaned them out Joe
Shane, I wish I did have some extra, I'd send them to you to see what you thought. But I only purchased seven: six for the Pr 16 LS2 and the other for the Pr 140 input tube.
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Old 01-20-2012, 08:37 PM
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A bit off-topic, but I need to find me some Reflektor 6H30DR-dp for one last go in the CT-5 to decide if I keep it or sell it. These tubes are gettin' hard to find.
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Old 01-20-2012, 08:45 PM
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Originally Posted by Puma Cat View Post
A bit off-topic, but I need to find me some Reflektor 6H30DR-dp for one last go in the CT-5 to decide if I keep it or sell it. These tubes are gettin' hard to find.
This ad in Audiogon is for the 6H30-DR. They are $360 a pair though:
6H30P-DR.Supertubes. NOS.Matched Pairs. BAT.Audio Rese... | Tube | AudiogoN

Do they have to be DR's? You can get the regular 6H30-EB's for $45 each (plus $8 if you want them cryoed).

Russian 6H30 - Upscale Audio

I've used these in my Pr 140 and they sound very good. I do think the DR's are a bit smoother but they're considerably more.

This was just a quick search, BTW.
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Old 02-10-2012, 03:27 AM
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I have swapped my PCC-88's in and out of my cj GAT and TW Acustik phono stagenice and slowly over the past month. This is the ultimate pecking order.

cj GAT - Telefunken PCC-88's sounded better than both the stk EH 6922's and Pope PCC-88's. Music is just clearer, better focused and better extension and control at both extremes.

TW Acustik phono stage - roles reversed - go figure?. Pope PCC-88 sounded magnificent with life and drive added to the sound. the tele in comparison almost collapsed the soundstage and the drive was muted.

The Tele and Pope combination is musically more satisfying. Time to buy another tele PCC-88 si I have a spare set for the GAT.

I still have a set of RCA and GE 12SN7GTA's to try in the other two tube positions of the phono stage that I need to try out.

cheers
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Last edited by turntable; 02-10-2012 at 03:32 AM.
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Old 02-10-2012, 03:33 AM
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Quote:
Originally Posted by turntable View Post
I have swapped my PCC-88's in and out of my cj GAT and TW Acustik phono stage. This is the ultimate pecking order.

cj GAT - Telefunken PCC-88's sounded better than both the stk EH 6922's and Pope PCC-88's. Music is just clearer, better focused and better extension and control at both extremes.

TW Acustik phono stage - roles reversed - go figure?. Pope PCC-88 sounded magnificent with life and drive added to the sound. the tele in comparison almost collapsed the soundstage and the drive was muted.

The Tele and Pope combination is musically more satisfying. Time to buy another tele PCC-88 si I have a spare set for the GAT.

cheers
Shane,
This is consistent with what I've found as well...that which tube sounds best is dependent on the circuit it's going into. I didn't like the RCA 12AU7 "clear tops" in my PV12 as much as I did the Mullard mil-spec 12AU7, the CV4003. OTOH, I preferred the "clear top" in the front-most socket of my EAR834P over the Mullard.

I also did not care for the NOS Telefunken 12AX7 in the rear two slots of my EAR834P; and these were *old* NOS Telefunkens...check out this box:



FWIW, I just installed a Genelex Gold Lion ECC82 (12AU7) in my EAR tonight....giving it a listen compared to the RCA Cleartop....
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Old 02-10-2012, 03:43 AM
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Stephen

yes, quite strange how the same tubes sound wonderful in one and not so good in the other.

I have 8 of the tele 12ax7's, however mine are "Fischer" branded and they are extremely good if you are looking for clarity and extension, whereas the Mullards generally add some warmth.

let us know what you think between the Gold Lion and RCA cleartop
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Old 02-10-2012, 04:29 AM
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Yes, I had my TFKs cryo'd and in retrospect, not sure if it was a good idea. Cryoing seems to make some tubes "harder" sounding, though it did wonders for the CV4003s.
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Last edited by Puma Cat; 02-10-2012 at 01:20 PM.
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  #49 (permalink)  
Old 02-10-2012, 08:57 PM
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Originally Posted by turntable View Post
I am using stk EH cj 6922's and I have tried JJ 6922's. The EH 6922 is very good imo and is quiet and neutral.
The JJ 6922's I have are a little rounder in the bass, relaxed in the treble and just a bit warmer all round. I prefer the EH 6922's in my system.

I just ordered from upscale audio

3 x Telefunken PCC88/7DJ8 - This is a 7 volt version of the super-expensive, impossible to find 6DJ8


3 x Philips Holland / Pope PCC88/7DJ8 - This is the same thing as an Amperex Bugle Boy.

Why did I order PCC88's. They are fully compatible with 6922 tubes and have a longer life. Telefunken and Amperex 6922's are a LOT more expensive.
Also my TW Acustik phono stage uses PCC88's, so opportunity to tube roll with two components.

I'll update how they sound after I receive them.
IMHO, if you want to use the PCC88 you should adjust the voltage of the filament supply, otherwise you are operating the tubes at a much lower cathode temperature than foreseen and the tube characteristics will suffer. In most cj preamps it is an easy mod - just changing a zener diode or adding a diode in series with the existing zener, as there is margin enough in the unregulated supply voltage.

But remember to undo the mod before frying your ECC88/6DJ8 in the modified preamplifier.
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Old 02-10-2012, 11:42 PM
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Quote:
Originally Posted by Rafale
Shane....i paid 114 euros each, and it is the best present which I made for my GAT.... dead quiet tubes with beautiful soundstage and transparency, for me NOS quality without the downsides, i had a bad experience recently with a Mullard Holland CV2492 in my ET250s....I believed that my speakers had exploded...
Tolerances and the selection is, I suppose, even stricter for the version diamond

The EAT ECC88 is a special quality double triode. The tube satisfies the specifications in accordance with MIL-E-1/1J168 (NAVY) from 18.6.1958.

Tight tolerances: In these tubes the tolerance of electrical ratings are reduced in comparision with standard tubes.

Vibration and shock proof: The tube withstands accelerationns of 2,5 g at 50Hz for lenghty periods and momentary shocks of 500g for short periods.

Cathode free from Interface: The cathode establishes no interface even in case where the heated tube is operated without plate current over lenghty periods.
If i get the GAT should I get EAT 6922 tubes??
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