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Old 8th August 2013, 09:20 AM   #891
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Location: Melbourne, Australia
Hi Desmo,
Please accept my apologies for getting you off side. It was sincerely not my intention.

Let me explain a little further and from now on the heat discussions are banished from this thread. The reason for my post is that firstly I live in Australia with 240v and my tram kit does not contain the transformer or the FCUPS board and therefore I figured that after reading 89 pages of this thread that perhaps I needed to look into what spec's to submit to the transformer manufacturer. I love class A and have two friends with TRAM 2's and by no means want to tear the construction apart and make all kinds of solutions to make it run cold I just want to avoid any costly repairs or potential hazards.

Thank you kindly for the capacitor information.

I wish you a truly great day and thank you for all of the information and insight posted on this forum.

Kind regards
Greg
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Old 8th August 2013, 09:33 AM   #892
Desmo is offline Desmo  Denmark
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No transformer or FCUPS..!? That's interesting, did you get ''the last parts we have left for a Tram II kit'' or something..?

OK, when that is the case I see the point of a different transformer. What you could do was to order one with 240V primary, and then you could spec the heater windings for (say) 5A - 7,5V. This will give you more headroom, and a slightly higher voltage to the RAW supply. Hereby you can have a little bigger resistor between first and second set of caps in the RAW supply.

What are you going to use for power supply instead of the FCUPS..?
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Old 8th August 2013, 11:40 PM   #893
reggie is offline reggie  Australia
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Thank you Rod for your advice. Although I am not technically proficient I will pass this information on to the technician doing the work for me. In the absence of any further suggestions I'll sign off for the time being.
Regards
Reggie
PS. I am conscious that in threads like this I, and others like me who have no real technical skills, are takers of information. So, maybe (philisophicaly speaking) the thread should be left to those who contribute information.
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Old 9th August 2013, 09:06 AM   #894
Mihan is offline Mihan  New Zealand
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Quote:
Originally Posted by PixelPlay View Post
Hi Guys,
Any advice on a ground up and custom FCUPS build would be greatly appreciated.
Perhaps we could get our own upgraded FCUPS boards made?

I will probably go down the TJ 2A3 road.Thank you for your time and help.
Let the journey begin.

Cheers
Greg
The power tranny is reasonably easy to reproduce or improve, but the FCUPS module will be your biggest headache. The design is fairly complex and is presumably owned by DIY Hifi Supply. It's not really a 'do it yourself' project.

Some of your options are:
To post on all the DIY audio forums to see if anyone has one for sale.
Or try to make contact with Thorsten Loesch who is a member of many audio forums and has a lot of knowledge of the Tram 2 and the FCUPS module and may be able to offer some ideas about a more conventional power supply that you can build. Others here may have ideas for such a design.

Last edited by Mihan; 9th August 2013 at 09:19 AM.
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Old 9th August 2013, 09:50 AM   #895
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Instead of the Fcups,,i think the Maida Regulator could be used..(tread on diyadio)
For the auto bias...Tent Labs Tube bias control will be a option
Best Bjarne
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Old 9th August 2013, 05:55 PM   #896
Desmo is offline Desmo  Denmark
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Quote:
Originally Posted by Mihan View Post
try to make contact with Thorsten Loesch who is a member of many audio forums and has a lot of knowledge of the Tram 2 .
Thorsten designed the Tram II, so he certainly has the knowledge on it
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Old 10th August 2013, 01:29 PM   #897
rab28 is offline rab28  Australia
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Quote:
Originally Posted by Desmo View Post
No transformer or FCUPS..!? That's interesting, did you get ''the last parts we have left for a Tram II kit'' or something..?
As reported earlier in this thread, a number of folks have been unable to buy a Tram2 in recent times because the CUPS supply is no longer available. However, the other parts of the Tram2 are still available, and so I believe the plan is to use a different high voltage supply.

As i understand it, the CUPS supply has some clever design features that allow it to be very compact and thus fit into the Tram2 chassis. However, if you don't care about size, then this allows the option of using a completely different supply circuit.

As for the transformer, the issue is not heat but current delivery. As i understand it, a number of modified Tram2s here in Australia have been unable to supply 2.5v (e.g, about 2.3V max) to the filaments of 45 tubes, which draw only 1.5A. The 2A3s draw 2.5A, and Lucas believes the transformer cannot supply enough current.

Having said that, i have difficulty reconciling this with Morten's post 360 in which he reports that he was able to supply enough current to the 2A3 after replacing two resistors on his power supply circuit, which i believe is one designed by Rod Coleman.
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Old 10th August 2013, 01:40 PM   #898
Desmo is offline Desmo  Denmark
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Quote:
Originally Posted by rab28 View Post
As reported earlier in this thread, a number of folks have been unable to buy a Tram2 in recent times because the CUPS supply is no longer available. However, the other parts of the Tram2 are still available, and so I believe the plan is to use a different high voltage supply.

As i understand it, the CUPS supply has some clever design features that allow it to be very compact and thus fit into the Tram2 chassis. However, if you don't care about size, then this allows the option of using a completely different supply circuit.

As for the transformer, the issue is not heat but current delivery. As i understand it, a number of modified Tram2s here in Australia have been unable to supply 2.5v (e.g, about 2.3V max) to the filaments of 45 tubes, which draw only 1.5A. The 2A3s draw 2.5A, and Lucas believes the transformer cannot supply enough current.

Having said that, i have difficulty reconciling this with Morten's post 360 in which he reports that he was able to supply enough current to the 2A3 after replacing two resistors on his power supply circuit, which i believe is one designed by Rod Coleman.
Yes I know that the FCUPS is no longer avaliable, I just assumed that they would then stop selling the Tram II, or find another PS for it, but it seems that they are willing to sell what ever parts they have for it... The FCUPS is an electronic-choke type supply. If you want, and have the space and money you can replace it with (for instance) a C - L - C - L - C supply... That is what I have used in this DIY phono stage in the attached pics. It takes space and more money. The chassis is the size of a small power amp.

The heater windings in the original mains transformer are spec'ed to 3A = they can deliver 3A continuous current. 2A3 tubes use 2,5A so still within specs. Almost all of us run 2A3 tubes in our Tram II's, some use the original DHT regulators, some use Rod Coleman regulators. They can both deliver the current - no problems. This testify that there is no problem what so ever delivering the current. If some of you have Tram II's that can hardly deliver current for 45's you have faulty transformers and/ord heater supplies or something of that kind. Or most likely: You use too large series resistors before the regulators (with the standard regs), or too big resistors between the two stages in the RAW supply for the Rod Colmeman. But I find it hard to believe that a professional (the guy who made your installations) would not know to use the correct resistors.

NO, these are not the resistors to ''replace'' on the rod coleman regulators. No resistors need to be ''replaced'' on his regulators. You just need to use the correct resistor value for a given tube current rating.
Attached Images
File Type: jpg IMG_2146.jpg (94.9 KB, 101 views)
File Type: jpg IMG_2148.jpg (91.3 KB, 94 views)
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Last edited by Desmo; 10th August 2013 at 01:46 PM.
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Old 10th August 2013, 04:19 PM   #899
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The Fcups also deliver the --75v for the Auto bias---so you must take care of this also
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Old 10th August 2013, 04:37 PM   #900
Desmo is offline Desmo  Denmark
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Yes, that's right Bjarne... (of course) all the voltages must be established, if different transformers and power supplies are used.
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