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Old 29th October 2012, 10:48 AM   #2061
AndrewT is offline AndrewT  Scotland
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The warning is valid.
If I could misunderstand his post then maybe others could do that as well.
Obviously Koldby read it differently from me.
The pic in post2057 shows dual primaries connected in parallel.
That pic does not show TWO transformers. It shows dual primaries and dual secondaries.
But that pic was posted after my warning post.
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Old 29th October 2012, 11:05 AM   #2062
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Quote:
Originally Posted by koldby View Post
AndrewT,
I believe you misunderstand him.
He has TWO transformers , each with a 220V primary and wants to parrallel couple these two transformers and then series couple the secondaries from the two transformers.
As long as the phases is the same for the two secondaries , this is ok as far as I can see..

Koldby
Thank you for your intervent.
Now I could rest assure to proceed my `Goldmund`.
I have just got the NOS BSS7/BSS74 with the help of a friend from China.
Hopefully that the project might come to completion before this Christmas.
I am sorry for the iinconvenient caused as English is not my mother tongue.

Last edited by Mikewong; 29th October 2012 at 11:07 AM.
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Old 29th October 2012, 11:06 AM   #2063
AJT is offline AJT  Philippines
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Quote:
Originally Posted by AndrewT View Post
The warning is valid.
If I could misunderstand his post then maybe others could do that as well.
Obviously Koldby read it differently from me.
The pic in post2057 shows dual primaries connected in parallel.
That pic does not show TWO transformers. It shows dual primaries and dual secondaries.
But that pic was posted after my warning post.

obviously you have no experience in paralleling transformers that is why your comment....
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Old 29th October 2012, 11:36 AM   #2064
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I once read that one of the Electrocompaniet`s amplifier (I forgot the model) uses two separate transformers, one for the +VDC,and the other for -VDC.
So there is where my idea came from but I never try this before.
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Old 29th October 2012, 12:29 PM   #2065
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Default Golmund clone

If you use +84/-84 V you will need 220mF/250 V after diode and there is no space available for capacitors 220mf/250V on board
Regards Nikos
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Old 29th October 2012, 02:53 PM   #2066
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by AndrewT View Post
Where's my post with the warning about connecting 110/120Vac windings to 220/240Vac supply?
Koldby saw it !
It was not relevant to the proposal discussed in this thread. The primaries were clearly stated to be 220V.. You know the rules about commenting on moderation decisions. End of discussion on the removal of your post.
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Old 31st October 2012, 02:22 AM   #2067
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Mikewong View Post
I once read that one of the Electrocompaniet`s amplifier (I forgot the model) uses two separate transformers, one for the +VDC,and the other for -VDC.
So there is where my idea came from but I never try this before.
That's probably because the rails are not symmetrical. For example +25V and -10V.

Check for example the Matti Otala's low TIM amplifier, that is also used by Electrocompaniet.
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Old 31st October 2012, 08:06 AM   #2068
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Jay can you point to me any of these schematics either from electrocompaniet or Matti Otala ?

kind regards
sakis
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Old 31st October 2012, 05:51 PM   #2069
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by sakis View Post
Jay can you point to me any of these schematics either from electrocompaniet or Matti Otala ?

kind regards
sakis
http://www.linearaudio.nl/Miscellane...stroh%20pp.pdf

http://users.ece.gatech.edu/mleach/p...77articles.pdf

your welcome.

stig
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Last edited by oiphy; 31st October 2012 at 06:06 PM.
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Old 3rd November 2012, 08:45 AM   #2070
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Originally Posted by alex mm View Post
Hi Luke ,
I have, for free two PCB's from a friend ,and 6 laterals N and P (I bought 10 pairs of EXICON's)left from my last project , so I have built the second amplifier with better parts . I like the sound , warm close to tube amplifier . I have also built 2 Grommes A260 modified PP amplifier with russian 6P3C and GU 50 tubes . Ultimately the sound depends on the speakers
@nikosokey
thanks for your comments , I will mount a bigger heatsink on VAS transistors.
Yes, you right , they are hot ......

regards Alex.
Hi.

I just have to ask.

I see a lot of You have gone for those EXICON output transistors.

But wich ones are the superior here? SK175/SK50 og the EXICON's?

I am a late starter in this project, but have built quite a few amps, but for some reason never with any of theese transistors. (The SK175/SK50 are original TANDBERG-transistors I have in stock here)

I also have a preamp design I probably should share with You.
I do not know it's origin, but have used it for some years, nad I'm very happy with how it sounds.

And Alex, I can't get to the dropbox-pics You put out a link to in here.

Could you also provide me with Your complete BOM and tweaks You have made to your fabolous builds?

Looking forward to start this.
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