Search found 29 matches
- Wed Aug 14, 2013 2:55 am
- Forum: Preamps
- Topic: Classic SE upgrade w/Teflon caps
- Replies: 16
- Views: 5830
Re: Classic SE upgrade w/Teflon caps
If you just paid for Teflon capacitors you are predisposed to believing that you can hear a difference. The difference "must" be an improvement and is "never" retrograde because such an admission would also be one of your own errors in judgement. I have built active crossovers us...
- Mon Aug 12, 2013 7:50 pm
- Forum: DIY, mods, tweaks
- Topic: Jolida JD9 phono preamp Upgrade Guide
- Replies: 11
- Views: 19300
Re: Jolida JD9 phono preamp Upgrade Guide
Be extremely wary of anything listed on aliexpress. Having lived in China for many years I know that practically everything is faked. More recently I have purchased aluminium chassis from a seller in Guang Zhau listing on aliexpress. A chassis is a chassis so fake or whatever doesn't bother me. But ...
- Mon Aug 12, 2013 4:54 am
- Forum: Preamps
- Topic: PV12>PV11>Premier 2
- Replies: 8
- Views: 3600
Re: PV12>PV11>Premier 2
I have a Premier Ten (got it for about $400 about 10 years ago). I also have a PV10AL. They sound the same to me, but if you put fancy valves (like French Mazdas of CIFTEs) into the PV10AL it will oscillate and scream like a siren after warming up. I believe it may need ceramic bypass caps installed...
- Mon Aug 12, 2013 3:17 am
- Forum: General Discussion - CJ related topics
- Topic: What is phase inversion and what do I do about it?
- Replies: 16
- Views: 6746
Re: What is phase inversion and what do I do about it?
Hi Jack, I bet the album to which you refer could also trick the mind. Flip the switch and walk out of the room and back again and you may not know whether "the phantom" switched it back. The inversions would be listener position-dependant. I.e. what some might consider "diffuse"...
- Mon Aug 12, 2013 3:06 am
- Forum: Preamps
- Topic: PV 12L and SS Power Amp Question
- Replies: 4
- Views: 1778
Re: PV 12L and SS Power Amp Question
SS power amps typically have an input impedance in the order of what you quote, whereas valve power amps are typically around 100K. Your PV12 doesn't care either way. Just use basic low capacitance interconnects such as Blue Jeans LC-1 and you'll be laughing. The speakers don't affect it. The "...
- Mon Jul 29, 2013 8:12 pm
- Forum: General Discussion - CJ related topics
- Topic: The Sound in Heart Conrad Johnson
- Replies: 11
- Views: 2761
Re: The Sound in Heart Conrad Johnson
Hi Raymond, I don't apply rules to anyone but myself. :D I have not used a turntable since the eighties. They are an archaic relic and do nothing but further distort an already confoundly corrupted recording. Even a gold-plated steam shovel could only dig the same dirt. I have been in audio clubs wh...
- Sun Jul 28, 2013 8:59 pm
- Forum: General Discussion - CJ related topics
- Topic: The Sound in Heart Conrad Johnson
- Replies: 11
- Views: 2761
Re: The Sound in Heart Conrad Johnson
The simple reality is that there is nothing special about the sound of C-J or any other high-end brand at all. I have built simple kit amplifiers that sound exactly the same at a small fraction of the cost. Indeed a dual opamp preamplifier on a PCB (e.g. ESP Project 88) that fits on the palm of your...
- Sun Jul 28, 2013 6:54 pm
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: cj pv2 transformer running hot
- Replies: 8
- Views: 2167
Re: cj pv2 transformer running hot
That imbalance might be just the old valves warming up. I see they are old Sovteks and Siemens, so they may be a bit long in the tooth. Maybe try to find some Syvanias or something. Tired valves take longer to "come up" on emission tests too. OK seems there may have been a production run c...
- Sun Jul 28, 2013 5:35 am
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: cj pv2 transformer running hot
- Replies: 8
- Views: 2167
Re: cj pv2 transformer running hot
Edit. The so-called PV-2 schematic in the download ZIP is a ring-in. It shows 4 tubes only and is the same as the other ring-in for a PV-3! Admin: get it right. Do not share misinformation. :shock: So take the following as though the schematic were correct which it is not. I discovered it after typi...
- Sat Jul 27, 2013 8:47 pm
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: cj pv2 transformer running hot
- Replies: 8
- Views: 2167
Re: cj pv2 transformer running hot
According to the schematic (which does not appear to be original), the power supply tranny has only a single primary winding which means that there is no means of adjustment for different countries, so that counts out the possibility of user error on that front. It does not count out the possibility...
- Fri Jul 26, 2013 8:52 pm
- Forum: Room design/acoustics/positioning
- Topic: A bigger trap in the corner
- Replies: 18
- Views: 9613
Re: A bigger trap in the corner
Toole P 266: 'Without your own acoustical measurements, you are "flying blind"'.
- Thu Jul 25, 2013 11:19 pm
- Forum: Room design/acoustics/positioning
- Topic: A bigger trap in the corner
- Replies: 18
- Views: 9613
Re: A bigger trap in the corner
I don’t think so. I have plenty more. Why would you post your floor plan if you considered it meaningless or weren't open to scrutiny? Perhaps you are just trying to be proud. I have been through the process and can tell you that you are wasting your time and money with commercial bass traps. Simple...
- Thu Jul 25, 2013 8:11 pm
- Forum: Room design/acoustics/positioning
- Topic: A bigger trap in the corner
- Replies: 18
- Views: 9613
Re: A bigger trap in the corner
Nope. I wouldn't need to. Read Toole yet? Run any impulse responses for left and right channels individually or any at all? Done a spatial average? I've done mine. I assure you that room is all over the shop and no absorption "product" that could fit inside the room can fix it. WIth that o...
- Thu Jul 25, 2013 7:39 pm
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: Pr17LS problem!
- Replies: 13
- Views: 2404
Re: Pr17LS problem!
In other words is he telling you that the thing is not competently shielded? It would not surprise me one bit. The thing should be designed to work in the modern world. All so-called sources of interference must comply with emission standards, so the problem is very unlikely to be those. Reminds me ...
- Wed Jul 24, 2013 4:37 am
- Forum: Room design/acoustics/positioning
- Topic: A bigger trap in the corner
- Replies: 18
- Views: 9613
Re: A bigger trap in the corner
The most effective traps in that layout are the openings into other rooms and there is an horrendous asymmety brought about by the opening at top right which your traps at bottom right do not help since they are "tuned" to absorb different frequencies. The commercial room treatment offerin...
- Wed Jul 24, 2013 4:20 am
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: Pr17LS problem!
- Replies: 13
- Views: 2404
Re: Pr17LS problem!
I'd go along with that placebo theory.
- Mon Jul 22, 2013 4:19 am
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: Pr17LS problem!
- Replies: 13
- Views: 2404
Re: Pr17LS problem!
An infrared thermometer can measure component temperatures without touching anything (accuracy depends on colour/emissivity of target - matte black being best suited for most inexpensive thermometers). I do not know your particular pre-amplifier, but I do know that C-J uses thermal cut-off switches ...
- Sun Jul 21, 2013 5:27 am
- Forum: General Audio and Video Discussion
- Topic: What have you been listening to?
- Replies: 44
- Views: 16816
Re: What have you been listening to?
For classical listeners I recommend any of the Jordi Savall/Le Concert des Nations/Hesperion XXI recordings on the AliaVox label. Rich ambient recordings - especially the SACDs. This one would be a great starter: http://www.amazon.com/Altre-Follie-Jordi-Savall/dp/B000A0HG16/ref=sr_1_3?ie=UTF8&qi...
- Sat Jul 20, 2013 2:18 am
- Forum: Troubleshooting/problems/manuals/schematics
- Topic: Premier 275 Crackling
- Replies: 4
- Views: 1619
Re: Premier 275 Crackling
OK seems I can't help you really. I had never heard of a Premier 280 or a Premier 275. Now I see that it was advertised as a "Premier 280" on Audiogon and it looks very suspicious. If it really was a one-off that never went into production, why would it be on the market? Clearly from the A...
- Wed Jul 17, 2013 3:43 am
- Forum: Preamps
- Topic: Classic SE upgrade w/Teflon caps
- Replies: 16
- Views: 5830
Re: Classic SE upgrade w/Teflon caps
Dear admin. As per my previous post, valves and speaker drivers are excluded from what I say about burn-in. You are correct about valves (you say tubes - I am Australian so I say valves). Here is an interesting link: http://sound.westhost.com/madashell.htm#burnin. I know the author personally. He wa...