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by plurn
Fri Sep 01, 2017 10:31 am
Forum: Amplifiers
Topic: CJ Classic 62SE broken tube!
Replies: 6
Views: 115

Re: CJ Classic 62SE broken tube!

That must be so frustrating. Hope you get it sorted out soon. Anyway congratulations on your new CJ gear.

When you get your new tube, make sure you follow the "Adjusting Output Tube Bias" section of the manual.

Anthony
by plurn
Tue Aug 29, 2017 1:18 pm
Forum: Preamps
Topic: new ET-7, the replacement for the ET-5
Replies: 31
Views: 675

Re: new ET-7, the replacement for the ET-5

How much gain does the ET-7 have? The spec for the ET-5 is 25 db, which probably accounts for the relatively shortened tube life before noise. I love my ET-5, btw. Just wish it were not so hard on the tube. At least it is only one tube. If the ET-7 gain spec is lower, say 20 db or so, we can specul...
by plurn
Tue Aug 29, 2017 12:53 pm
Forum: Preamps
Topic: new ET-7, the replacement for the ET-5
Replies: 31
Views: 675

Re: new ET-7, the replacement for the ET-5

Here is the inside pic of the ET-7. Hi Roberto, Thank you for posting the inside pic. I have not noticed any other website having a picture of its insides so maybe conradjohnsonownsers.com is first. When I compare the insides of the ET7 to the ET5 I am a bit surprised. ET7 has a lot less big white ...
by plurn
Mon Aug 14, 2017 5:36 am
Forum: Preamps
Topic: new ET-7, the replacement for the ET-5
Replies: 31
Views: 675

Re: new ET-7, the replacement for the ET-5

Thank you Roberto.

Anthony
by plurn
Sat Aug 12, 2017 1:16 pm
Forum: Amplifiers
Topic: Hum problem with LP125m SE
Replies: 16
Views: 272

Re: Hum problem with LP125m SE

... it exists even when the interconnects from the preamp are not connected. Currently I am using a Torus Power AVR15 for supplying power to the power amps ... A quick update. Floating the ground on both mono blocks completely solves the problem. I am not very comfortable with this solution but whe...
by plurn
Sat Aug 12, 2017 12:43 pm
Forum: Preamps
Topic: new ET-7, the replacement for the ET-5
Replies: 31
Views: 675

Re: new ET-7, the replacement for the ET-5

Congratulations Roberto and thanks for your impressions.

Can you tell us what tube or tubes it uses? single electro harmonix 6922? or Philips PCC88 maybe? If you are inclined to open up the case, any chance of some pictures of the insides?

Anthony
by plurn
Sat Aug 12, 2017 12:18 pm
Forum: General Discussion - CJ related topics
Topic: Where do you buy your tubes? From Conrad Johnson or ....
Replies: 22
Views: 2606

Re: Where do you buy your tubes? From Conrad Johnson or ....

I stocked up on a heap of new old stock philips PCC88 from Electols/Halfin in Belgium for my ET5. Same tube that CJ uses for GAT 2 (and GAT in some cases). Very likely suitable for ET3 too. Due to Electols long history supplying tubes (since 1946!) I would not be surprised if they bought them direct...
by plurn
Tue Feb 14, 2017 10:09 am
Forum: Troubleshooting/problems/manuals/schematics
Topic: CJ PV10 AL
Replies: 17
Views: 676

Re: CJ PV10 AL

I'm glad you got it sorted out. Thanks for letting us know. It is alway good to hear about a problem being fixed.

Anthony
by plurn
Wed Jan 25, 2017 11:09 am
Forum: Amplifiers
Topic: CAV45 with Harbeth C7?
Replies: 13
Views: 466

Re: CAV45 with Harbeth C7?

Glad you sorted it out Scott. Sorry for misdiagnosing the issue.

Anthony
by plurn
Sun Jan 22, 2017 9:24 am
Forum: Amplifiers
Topic: CAV45 with Harbeth C7?
Replies: 13
Views: 466

Re: CAV45 with Harbeth C7?

... At lower levels it sounds glorious, but at average or slightly above average levels the sounds starts to harden and flatten out. ... Yeah this effect of "harden and flatten out" is the compression you get when driving a tube amp beyond its limits. It is the sound of the clipping of a tube ampli...
by plurn
Sun Jan 22, 2017 7:35 am
Forum: Preamps
Topic: Premier 16 II vs. ET 5
Replies: 19
Views: 2466

Re: Premier 16 II vs. ET 5

I have an ET5. I also have a Prem 16LS2 ... ET5 definitely less romantic and better bass. Prem 16 more 'golden' and rolled off in treble. Which is better is a matter of taste and associated equipment. I do have a question for those here... The ET3 SE is well known to be very high gain and very hard...
by plurn
Sat Jan 14, 2017 12:13 pm
Forum: Amplifiers
Topic: Tune up procedure
Replies: 4
Views: 203

Re: Tune up procedure

I am not a tech so excuse me if I get this wrong. My understanding is that if a device has not been used for a long time, it can be good to power it up on a variac ( variable power supply ) at a lower voltage than your standard mains voltage, and you slowly bring it up to standard voltage. I think t...
by plurn
Sat Jan 14, 2017 11:56 am
Forum: Troubleshooting/problems/manuals/schematics
Topic: KNOB Volume for PV12
Replies: 2
Views: 163

Re: KNOB Volume for PV12

Sorry - I don't know. I would guess it is 50 kilo-Ohms (50kΩ, or 50,000 Ohms) based on the name. Also would need to be dual channel. You could try asking Alps what the current equivalent is for a ALPS 616N 50KDX2, or try asking Conrad Johnson what the specifications are for the volume control. I jus...
by plurn
Sat Jan 14, 2017 11:32 am
Forum: Troubleshooting/problems/manuals/schematics
Topic: ET3 se sounds distorted
Replies: 2
Views: 507

Re: ET3 se sounds distorted

It would be interesting to hear if Anthony resolved his issue and what the solution was. Strange that no-one responded to him back then. I think it is unlikely that the phono stage is out of phase - in terms of left channel being the opposite phase of the right channel. I think the phono stage is ph...
by plurn
Sat Dec 03, 2016 11:17 pm
Forum: Preamps
Topic: PV-1 to PV-2AR conversion
Replies: 2
Views: 302

Re: PV-1 to PV-2AR conversion

Hi Steve, Can you tell us about the rest of your system? It could be that you have very efficient speakers and/or an amplifier with high gain. If this is the case, then any hiss or hum will be exaggerated and will be audible in your system. The gain in conrad johnson preamps is very high by the way....
by plurn
Fri Nov 11, 2016 10:02 pm
Forum: Troubleshooting/problems/manuals/schematics
Topic: New to me PV2A
Replies: 5
Views: 354

Re: New to me PV2A

Is there something else to look at, that might be the issue? first off - don't get electrocuted - be careful due to high voltages. Some general simple checks I would do to try and narrow down where the issue is: - check that it is actually powering up. Is the light turning on near the power switch ...
by plurn
Fri Nov 04, 2016 10:27 pm
Forum: Preamps
Topic: The six-channel MET1
Replies: 60
Views: 9995

Re: The six-channel MET1

... Sounds fantastic for sure...or did. It was heaven for about 90 min until..boom..all sound ceased immediately. It now just plays about the same volume as a turntable cartridge level--no matter what the volume there is little to no amplification. ... Just from rereading your old post, are we sure...
by plurn
Fri Nov 04, 2016 10:11 pm
Forum: Preamps
Topic: The six-channel MET1
Replies: 60
Views: 9995

Re: The six-channel MET1

... US fuse F1 should be 1/2amp...and is is 1/4. UK spec as I suspected US fuse F2 should be 1/4 amp...and is is....very interestingly T500 so 500ma which is 1/2 amp. Uk spec is 1/8 amp. This could be an issue. I would think the fuses for F1 and F2 were placed in the wrong order. If they were swapp...
by plurn
Fri Nov 04, 2016 9:27 am
Forum: Preamps
Topic: The six-channel MET1
Replies: 60
Views: 9995

Re: The six-channel MET1

From the schematic it looks like V5 6C4 is centre (CTR on the schematic). V1 LF left Front V2 RF V3 LF left rear V4 RR V5 CTR http://www.conradjohnsonowners.com/viewtopic.php?f=17&t=128 In "Part 1" Schematics file Anthony edit: not sure if that helps. I don't have a MET1 so I don't know if each tube...
by plurn
Fri Nov 04, 2016 9:18 am
Forum: Non-CJ Products-Audio
Topic: The Martin Logan Ethos- one superb value in electrostats
Replies: 18
Views: 1222

Re: The Martin Logan Ethos- one superb value in electrostats

Congratulations RJ. I've enjoyed reading about the virtues of your Quads. It is a shame they have not been reliable. I am glad you found a suitable replacement.

Cheers,
Anthony