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Old 24th March 2013, 10:27 AM   #661
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In the meantime Ive tracked down an exceedingly rare and old rectifier from an old radio operator called Luigi that rather surprisingly is younger then him. It should, on paper, outperform every other tube. It will probably sound awful. If its any good I will let you all know after cornering the worlds remaining supply and inflated the already ridiculous price to the incredulously ridiculous level.[/QUOTE]

Hugh, but what is the tube called. Is it Italian. Where can I get a dozen to last the like time of my Tram2. I want to get in before the price sky rockets.

Peter
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Old 24th March 2013, 11:57 PM   #662
ktuuri is offline ktuuri  Canada
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Quote:
Luigi tells me he was a radio operator in WWII and sent a picture with his special rectifiers in the top right.
Kind of hard to say as the pic isn't to good, but if I were to guess, I would say they were 872a Mercury Vapor Rectifiers.
Big radio setups back then often used Mercury Vapor Rectifiers, and judging by the size of them, I believe they are 872a tubes, or maybe even 575a tubes.
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Old 25th March 2013, 12:29 AM   #663
gjm is offline gjm  United Kingdom
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I've always fancied having something using Mercury Rectifiers - VT83s, perhaps.

Just a little bit of madness. No technical reason.

Graham
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Old 25th March 2013, 03:59 AM   #664
kazap is offline kazap  Australia
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Quote:
Originally Posted by gjm View Post
I've always fancied having something using Mercury Rectifiers - VT83s, perhaps.

Just a little bit of madness. No technical reason.

Graham
Mercury exposure causes more then a "little bit of madness".
As Im quite mad enough Ive decided to stick with with Morten's Philip and Brimar
rectifier recommendations. This has the bonus of reducing my personal SNR in this thread
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Old 27th March 2013, 02:15 PM   #665
Desmo is offline Desmo  Denmark
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Ok... Finally did enough comparisons between the Philips and Brimar rectifiers to lock in on the differences. I think it's hard to compare rectifiers because it's not a simple A/B test. The preamp/amps has to be shut down, new rectifier in, power up, wait for everything to settle in again... And by this time it can be tough to remember small differences (for me at least). But I have gone back and forth enough to be quite certain of the differences now. Mind you, the Brimar is mentioned as ''one of the great ones'' and in the same league as the WE 274B and a few others, so how does the Philips compare..!? This is what I hear in my system (system picture for reference).

The differences are really at the ends of the frequency spectrum, where the Philips has it's focus in the bass and midrange, the Brimar has it's focus in the midrange and treble.

The Philips has the fuller, more dynamic and powerful sound. Compared to the Brimar it's fuller in the bass and lower midrange and the treble is sweeter and a bit more recessed. This gives the impression of ''meat on the bones'' and a sonic landscape that has an excellent foundation, grounding and punch. But the treble is a bit mellow and not as open as the Brimar.

Swapping in the Brimar the impression at first can be a bit like; where did the bass go..!? Getting used to the Brimar, there is not a lack of bass, but the bass is more nimble and not with the power of the Philips. This gives a slightly leaner sound, but also a sound that appears to have a bit more transparency and more precision. The treble of the Brimar is truly wonderful and noticeably more open and resolved compared to the Philips.

If one think the Philips is neutral, then the Brimar will sound a bit too bright. If one think the Brimar is neutral, then the Philips will sound a bit too dull... So in a system, that is a bit on the lean side: Philips and in a system that is a bit on the full side: Brimar. I think they are at the same sonic level, one is not better than the other, it's a matter of system matching. I think the Brimar was lightly used before I got it where as the Philips was clearly NOS (unopened original box), so maybe the Philips needs more hours to fully open up in the treble range, I have only around 50 hours on it now. I will continue to use the Philips for now to put some hours on it, if it opens up more in the treble range and get's closer to the treble of the Brimar then I will say the Philips (in my system) is the better choice...

Here are some pics of the Brimar if you want to look for one. They are made in the 1950's, not that expensive but not that easy to find. This one has the logo on the glass bottle, some has it on the (brown) base. The internal structure is with black ribbed anodes and with dual halo getters at the bottom.
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File Type: jpg IMG_4978.jpg (93.7 KB, 93 views)
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Last edited by Desmo; 27th March 2013 at 02:20 PM.
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Old 27th March 2013, 02:31 PM   #666
kazap is offline kazap  Australia
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Thanks Morten for your wonderful rectifier review and great photos.
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Old 27th March 2013, 05:58 PM   #667
Desmo is offline Desmo  Denmark
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Your welcome... By the way: Bjarne, how many hours do you have on your Philips rectifier now? How have you heard it develop from new to how it sounds now..!?
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Old 27th March 2013, 11:55 PM   #668
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Hello Morten
it will be at bit difficult to tell if the Phillips tube are better now,than before...i have get some new opamp (ad8620) in my groundsound filter..so i can not tell if i heard the tube or the opamp
one thing is for sure..it is more quiet than the Russian tube i use before,,,for the first time i can not hear noise where i normally sit---but still ,love the sound from the Phillips tube
best Bjarne
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Old 28th March 2013, 09:49 AM   #669
Desmo is offline Desmo  Denmark
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Good to hear that you like the Philips, it (and the Brimar) is a very clear step above the ''standard'' rectifiers So you still had noise, until the Philips..!? Was this hum or a different kind of noise?

Strange that you have had this many noise issues..! It can -maybe- be down to the wiring of your DHT regulators. They need to be really short, and it's good to have the wires run close to grounded parts like heatsinks or equal. Here at my place my Tram II is now very quiet. It's not until I have the ear around half a meter from the speaker that I can hear a faint hum. Going to the fixed resistor set-up on the CCS modules also reduced noise - and of course there is now zero drift... I think that the Tram II is finally a ''finished product'' and not a collection of nice of parts, not fully developed. I'm looking forward to compare it to friends high end preamps soon, and I hope it will do well
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Last edited by Desmo; 28th March 2013 at 09:53 AM.
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Old 28th March 2013, 10:53 AM   #670
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The noise is a kind of hiss..not hum..with the Phillips it is much lower..no problem
just find out that there is less noise ,when i use my player without dac--not much but i can hear it (could be the dac gives more information)
but all in all no problem with noise
best Bjarne
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