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Post by PinkFloyd on Jun 14, 2007 22:19:51 GMT
I don't know quite where or how I got sidetracked down the 6H1P-EB route but I took a left a few miles down the road and am firmly back 0n route 6N23P and what a smooth road it is  The 6H1P-EB has proven to be a very bumpy, twisting road with a few accidents along the way. I can't blame the road as I wasn't driving along it at the time but most of the accidents other drivers have reported have occured when they were travelling on route 6H1P-EB. These accidents have ranged from burnt out transistors to total meltdown of transformers (the transformer seeing a dead short) there have only been a "few" reported accidents on route 6H1P-EB but, as far as I'm concerned, one too many. I don't want to go into the long and short of it but I cannot recommend the 6H1P-EB any longer.... there are too many variables involved and you either get a "good pair" or a "bad pair" I'm tuned in with hundreds of X-Can users and usually it's a bullet proof reliable unit..... the amount of faulty amps I'm hearing about with 6H1P-EB onboard is enough to make me recommend you don't use them.... it's only a VERY small percentage of amps using 6H1P-EB that have experienced faults but I don't like the trend. The 6N23P is still my favourite route and as smooth as silk (and solid as a rock / stable / reliable). |
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Post by PinkFloyd on Jun 14, 2007 22:57:52 GMT
Mike, what about 6H1N? Thanks. Yep, those too Miguel. Don't panic, the ones you have are probably 100% all I am saying is I have received a fair few emails from people recently who's amps have gone tits up and all of them happen to have the 6N1P-EB in circuit. I didn't want to say anything here (and have held back) but there are one too many v3's failing with 6N1P-EB on board.... It seems the 6N1P (from what I can make out) doesn't just fail gracefully it causes a dead short and wipes out either the PSU or transistors or a combination of both..... the strangest part is they still work (the 6N1P) almost as if they go into a short and then decide it's business as usual  It could be my imagination running away with me here but I just have the feeling that there's something not quite right about them and always expect them to act up (I used to get the same feeling with the LM6171 opamp) Benny will probably call me a nancy boy.... I don't give a shit, but I wont be employing them anymore  |
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Post by Deleted on Jun 14, 2007 23:35:18 GMT
I agree with the theory about a transient internal short circuit. I wonder if they are cheap copies of the original design ? I also wonder if extra ventilation may be the answer ?
However,if they were in my amplifier , I would be so alarmed about the possibility of damage elsewhere as Mike has spelled out, that I would replace them without delay.
SandyK
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Post by Deleted on Jun 15, 2007 23:26:04 GMT
Miguel
If you are using them, do you have plenty of ventilation in the case ? It is possible that the internals are flashing over at elevated temperatures due to expansion .
SandyK
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Post by bennyboy on Jun 16, 2007 18:00:42 GMT
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Post by Deleted on Jun 16, 2007 21:29:49 GMT
Miguel
I was referring to the fact that some poorly manufactured valves may arc internally . This is more likely to happen at elevated temperatures. Even some picture tubes do this from time to time, with nasty results to other parts of the circuit.
Perhaps I wrongly assumed that we were still talking about the 6N1P-EB?
SandyK
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Post by Deleted on Jun 16, 2007 23:53:24 GMT
Miguel
I usually try to leave the tube related gear to Mike, as I haven't had much to do with valves in recent years.I normally only reply to these types when I remember from the distant past, and
am fairly confident that what I am saying is correct. BTW, I built my first valve amplifier around 1955 in a Postmaster General's training school classroom. It used a 6V6GT with an output transformer, and the distortion at maximum useable power was around 10% !!! I would have also replaced a few hundred dead, low emission or microphonic tubes in telecom. gear earlier in my career.
SandyK
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Post by Deleted on Jun 16, 2007 23:54:08 GMT
Miguel
I usually try to leave the tube related gear to Mike, as I haven't had much to do with valves in recent years.I normally only reply to these types when I remember from the distant past, and
am fairly confident that what I am saying is correct. BTW, I built my first valve amplifier around 1955 in a Postmaster General's training school classroom. It used a 6V6GT with an output transformer, and the distortion at maximum useable power was around 10% !!! I would have also replaced a few hundred dead, low emission or microphonic tubes in telecom. gear earlier in my career.
SandyK
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Post by sinwerm on Jun 27, 2007 5:45:58 GMT
Been listening to the 6N23P now for about a week or so and I agree totally with the way you describe them Mike , very smooth. The problem is I really like the punch and upfront sound of the 6H1P-EBs for my ears and my HD-580s really seem to like them also... Do you think the problem will also apply to the V2 with the EBs ? I bought a tested matched pair from a U.S. source. Also have my V2 heatsinked , made quite a difference the case doesnt get near as warm as it used to but the finned heatsinks I use get hot (very) so I have good heat tranfer.
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Post by scott on Oct 2, 2007 12:04:59 GMT
Can i use the 6N23P in the X-Can v3 with the standard powersupply??
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