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Old 23rd February 2013, 04:13 PM   #591
kazap is offline kazap  Australia
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Thanks Morten for the beginner level instructions which I needed.
You are right the blutac is very crude compared to your elegant mod.
Ive spotted the R8 surface mounted resistor now using the camera as a magnifier and think even I might be able to follow your led now. This might inspire others to have a go as well, now we can see how achievable it is.
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Old 25th February 2013, 12:03 PM   #592
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My TRAM is for SALE now in German Audiomarkt.
Triode Technology / TRAM MK2 (Gebrauchtgerät) Röhren-Vorverstärker Interessantes Angebot !
Just contact me regarding any questions.
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Old 25th February 2013, 09:16 PM   #593
Desmo is offline Desmo  Denmark
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Quote:
Originally Posted by marybety View Post
My TRAM is for SALE now in German Audiomarkt.
Triode Technology / TRAM MK2 (Gebrauchtgerät) Röhren-Vorverstärker Interessantes Angebot !
Just contact me regarding any questions.
Just curious, what makes you sell the Tram II? And what will your new preamp be?
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Old 28th February 2013, 04:46 PM   #594
Desmo is offline Desmo  Denmark
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Looking around at the Internet it seems that some prefer the 5R4 type rectifiers to the 5U4 types. I just bought one of these Philips 5R4GYS rectifiers to try in the Tram II. Even if it's not a direct replacement for the 5U4G it seems to work OK... One thing though is, that the first capacitor after the rectifier should be max 4uF with these. This is somewhat lower value than for the 5U4G. Does anyone know the value of the first cap on the FCUPS module..!?

This is the first rectifier I try where there is a noticeable difference in sound. Before the Philips I used the Valve Art 274 rectifier, and the Philips is noticeably smoother and slightly warmer in the mid range and lower treble. It's not so warm that it becomes boring, and it does not lack transparency... Very nice, and not a lot of money.
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Last edited by Desmo; 28th February 2013 at 04:49 PM.
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Old 28th February 2013, 08:49 PM   #595
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Morten, the first two Obbligato caps FCUPS module are 10uf each. As the 5U4G can take 40uf, 20uf as the first cap is safe.

Go to the dark side and try a GEC U52, brown base with D getter. It's just like buying the Full Music 2A3 SE.
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Old 28th February 2013, 09:14 PM   #596
Desmo is offline Desmo  Denmark
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Hi Peter, Yes I notice from the board, that it could seem like the two first 10uF are the input caps. I will measure the capacitance from the rectifier pin 8 to ground to check/verify.

After I asked the question I talked to someone I know who has half a life experience with tubes. It should not be critical with the bigger cap compared to the 4uF rating on the 5R4 rectifiers. He believe -worse case- that the expected life will be down from around 5000 hours to around 3-4000 hours. I can live with that since the tubes cost a lot less than the good quality 5U4 and U52.

I told him about what I heard from the NOS Philips 5R4, and he agress and say that he belive they sound as good, or maybe even a bit better than the best 5U4 or U52. But the 5R4 types are not hyped (yet) in the audio world, so prices are much lower (yet). I have ordered some more to get a few of them before the prices go up. I ordered one more of the Philips and also a Brimar...

No hyped and very expensive dark side for me You know me, I hate paying a ton of money for hyped NOS tubes...
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Last edited by Desmo; 28th February 2013 at 09:16 PM.
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Old 1st March 2013, 01:04 AM   #597
kazap is offline kazap  Australia
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Thanks Desmo for a very interesting lead on rectifier choices. The sound you described with warmer lower treble and retaining transparency is just what I like. So Im very interested in trying these. The Philips 5R4GYS internals looks like a DHT too?

Click the image to open in full size.


Knowing so little about electronics I have concerns that the 5R4GYS might run too far out of specification for the Tram2 in ways other then the capacitance issue. What do you think of these opinions?

"can you substitute 5U4 with 5R4? "

heater current. "the 5U4 draws 3 amps @5v while the 5R4 draws 2amps." Is this a good thing meaning the Tram2 will run cooler?

current handling capacity. "5U4 can handle up to 1000ma while the 5R4 can only handle 250ma."

voltage drop difference "The 5R4 has a voltage drop of 67V. The 5U4 has a drop of 58V. Depending on where the B+ is the tube swap might take voltages out of spec."

My impression is that the 5R4 is a lower spec'ed rectifier and is markedly out performed by the 5U4. Is it possible the softer sound signature of the 5R4 is simply a fault that is caused by its inability to provide enough power to support the dynamic peak loads?

Thanks

Last edited by kazap; 1st March 2013 at 01:30 AM.
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Old 1st March 2013, 05:42 AM   #598
Desmo is offline Desmo  Denmark
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My only concern regarding spec is the one you don't mention with the input cap rating, and as mentioned the guy I talked who knows tubes says it does not mean much.

I have not said it sound soft..! This is your own interpretation... I have said it sounds smoother and slightly warmer. It's not soft by any means, I would say that dynamics are the same as before, and the sound is a s firm and punchy as ever. What is improved is, that they appear smoother, less grain, slightly warmer in the midrange and lower treble and that the transparency is amazing. I listened some more last night, and transparency is quite a lot improved, I would also say, that dynamics in the treble range is improved. When I hear stuff, that BOTH appear a bit darker AND have improved transparency then I take notice...
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Last edited by Desmo; 1st March 2013 at 05:46 AM.
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Old 1st March 2013, 09:34 AM   #599
kazap is offline kazap  Australia
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Thanks Morten for that great clarification.
Ive ordered three of what I hope will be Philips 5R4GYS rectifiers off eBay - wish me luck

Last edited by kazap; 1st March 2013 at 09:52 AM.
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Old 1st March 2013, 09:56 AM   #600
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Hugh, how is the GEC U52 sounding. Is it like the sound described by Morten?

Peter
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