AudioAficionado.org  

Go Back   AudioAficionado.org > Manufacturers Forums > Conrad-Johnson

Conrad-Johnson It just sounds right

Reply
 
Thread Tools Display Modes
  #181  
Old 09-30-2016, 01:47 AM
bgiliberti bgiliberti is offline
Senior Member
 
Join Date: Oct 2011
Location: Washington, DC
Posts: 139
Smile

Quote:
Originally Posted by plurn View Post
From your earlier post, was there any reason you chose to raise this question quoting my post specifically, as opposed to any of the other posts from other people talking about old tubes? From your earlier post it kind of sounded like you found something about the situation I presented that made you think "aha - those might be counterfeit". If that is the case, what was it about my situation that made you think that at the time? I expect I have since allayed your fears about this for my purchases, since I provided more information on the integrity of the supplier in my last post.

Or do you think all claimed "new old stock" tubes from all suppliers are counterfeit (or used)? From your last post, it is not clear but it kind of sounds like that is what you might be getting at when you say "the term NOS at this point strikes me as total joke. Like Phillips and Telefunken did not see the transistor age coming, and kept producing warehouses full of old tubes that audiophiles are now paying a fortune for? Give me a break."

Anthony
Although I responded to your post, I was speaking generally. Also, if you paid a fair price, and the tubes sound great, who cares? I certainly don't think "all" of the NOS tubes are counterfeits or knock-offs, 95% would be more like it. However, if someone who retired from Phillips or Telefunken in 1964 posted that his retirement party was held in a warehouse filled with millions of obsolete tubes, I would lower my estimate to 80%. Have at me NOS valve distributors...
__________________
CJ Classic SE pre; CJ MF2550 amp; Harbeth 30; Marantz SA8004; generic silver int. cable
Reply With Quote
  #182  
Old 09-30-2016, 03:06 AM
plurn plurn is offline
Member
 
Join Date: Jun 2014
Posts: 36
Default

Quote:
Originally Posted by bgiliberti View Post
Although I responded to your post, I was speaking generally. Also, if you paid a fair price, and the tubes sound great, who cares? I certainly don't think "all" of the NOS tubes are counterfeits or knock-offs, 95% would be more like it. However, if someone who retired from Phillips or Telefunken in 1964 posted that his retirement party was held in a warehouse filled with millions of obsolete tubes, I would lower my estimate to 80%. Have at me NOS valve distributors...
Thanks for clarifying your point of view.

Anthony
Reply With Quote
  #183  
Old 09-30-2016, 07:09 AM
turntable's Avatar
turntable turntable is offline
Senior Member
 
Join Date: May 2009
Location: Downunder in Sydney
Posts: 1,769
Default

Quote:
Originally Posted by bILLwOJO View Post
Wow, those things really eat tubes. They should have had a way to lower the filament voltage down to 6.1V or so. The old Dynaco preamps came with Telefunken tubes from the factory. Yea, I know, not in the same league as A CJ preamp but they ran the filaments a little low and most of these can be found with the original tube compliment still in them. Heck, when I found my crusty MC40 monoblocks they still had most of the original tubes.
CJ should come up with a solution and fix all of these at no charge. A lot of coin for a flawed design.

BillWojo
Certainly not a flawed design. One of the best sounding preamps ever made and still is.
The trouble is current 6922 production is shite unfortunately.

I have had my Telefunken tubes for over two years and no further problems and it sounds like a dream.
Reply With Quote
  #184  
Old 10-08-2016, 09:29 PM
microstrip's Avatar
microstrip microstrip is offline
Senior Member
 
Join Date: Jun 2011
Posts: 394
Default

Quote:
Originally Posted by plurn View Post
Further to my earlier post http://www.audioaficionado.org/conra...tml#post802534 I decided to stock up on the Philips PCC88 tubes while they are still relatively cheap at the place I buy them. These should last me a while:



For my current usage of about 2700 hours per year, I estimate these 30 tubes will last at least 16 years in my ET5. Could end up less than that or a lot more then that depending on various factors. Hopefully most of them are as good as the four that I originally purchased.

Does anyone know if these are the same as the one CJ supplies for the GAT? They have factory code DJER.

What follows is probably of no interest to anyone but you never know.

Researching these tubes I have the following information:

- from the factory code DJER, DJ = PCC88. Don't know what ER stands for.
- They are not from CJ or from Upscale Audio. Upscale says the following about their Philips PCC88 which looks the same "This tube has Philips Holland parts, and the associated sound. They were assembled in the Ei factory according to the small etched codes on the glass.". They don't say what the code is.
- Another site worthpoint had very similar looking Philips PCC88 for sale in the past and their ones had factory code "DJER @ 4I". Their description said "Philips PCC88 Produced in Sept. 1964 for Philips by EI (Electronska Industria, Jugoslavia)". My ones just have factory code DJER rather than "DJER @ 4I". Perhaps from the "4I", the 4 indicates 1964, and the "i" indicates september? If that is the case then I suspect something in the "ER" from DJER indicates that they were produced by EI.

So I don't know if that means mine were made by EI or somewhere else. I suspect they were made at EI with Philips Holland parts since all the others seem to be. If they were made in Holland I would think they would say "Made in Holland". That is just a guess.

Anthony
I also bought a large stock of the same type PCC88 Philips with codes DJER 4F and 4G. I have measured about 10 and they are in general low noise and both triodes are matched in gain and DC - an important parameter as the sections work in parallel in my LP275s. From these 10 only one had one noisy triode in the low frequencies - it is now burning-in for a few days, as I have found that some tubes that are initially noisy become silent after 50-100 hours burn-in.

Measuring a few used noisy ECC88/6922 I have found that their triodes were significantly unbalanced. Probably tubes in these conditions will ear out much faster as the tube current does not split equally between the triodes.
Reply With Quote
  #185  
Old 10-09-2016, 11:36 AM
plurn plurn is offline
Member
 
Join Date: Jun 2014
Posts: 36
Default

Quote:
Originally Posted by microstrip View Post
I also bought a large stock of the same type PCC88 Philips with codes DJER 4F and 4G. I have measured about 10 and they are in general low noise and both triodes are matched in gain and DC - an important parameter as the sections work in parallel in my LP275s. From these 10 only one had one noisy triode in the low frequencies - it is now burning-in for a few days, as I have found that some tubes that are initially noisy become silent after 50-100 hours burn-in.

Measuring a few used noisy ECC88/6922 I have found that their triodes were significantly unbalanced. Probably tubes in these conditions will ear out much faster as the tube current does not split equally between the triodes.
That is good that they have acceptable measurements and that a good proportion of them are usable. Thanks for reporting the codes. I would think 4F = 1964 June, and 4G = 1964 July.

You have inspired me to check the codes on my tubes more closely. I have found that on some of them, the second row of codes is just barely visible and almost readable with a magnifying glass and a flashlight.



Under the DJER row, mine seem to have a row with three characters starting with a partial circle character, followed by 4H. I think the partial circle character must be this one for "Elektronski Industija, Nis, Yugoslavia":



I would think the 4H would be 1964 August.

Anthony

Last edited by plurn; 06-08-2018 at 04:25 PM. Reason: updated image url
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Audioaficionado.org tested by Norton Internet Security

All times are GMT -4. The time now is 02:24 PM.



Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
ęCopyright 2009-2019 AudioAficionado.org.Privately owned, All Rights Reserved.
Audio Aficionado Sponsors
AudioAficionado Subscriber
AudioAficionado Subscriber
Inspire By Dennis Had
Inspire By Dennis Had
Harmonic Resolution Systems
Harmonic Resolution Systems
Wyred4Sound
Wyred4Sound
Dragonfire Acoustics
Dragonfire Acoustics
GIK Acoustics
GIK Acoustics
Esoteric
Esoteric
AC Infinity
AC Infinity
JL Audio
JL Audio
Acoustic Sciences Corportation
Acoustic Sciences Corportation
Legend Audio & Video
Legend Audio & Video
Audio by E
Audio by E
Canton
Canton
Bryston
Bryston
WireWorld Cables
WireWorld Cables
Stillpoints
Stillpoints
Bricasti Design
Bricasti Design
Furutech
Furutech
Shunyata Research
Shunyata Research
Accuphase
Accuphase