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Old 18th January 2013, 02:22 AM   #2121
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Tandbergen,

you can buy 25x Elko radial 220uF 200V 10000h @ 105C RM5 12,5x40mm ; RoHS ; EKXJ201ELL221MK

here 25x Elko radial 220uF 200V 10000h @ 105C RM5 12,5x40mm ; RoHS ; EKXJ201ELL221MK | eBay

Br Walter
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Old 19th January 2013, 07:20 PM   #2122
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Originally Posted by WALTER BURKHARD View Post
Tandbergen,

you can buy 25x Elko radial 220uF 200V 10000h @ 105C RM5 12,5x40mm ; RoHS ; EKXJ201ELL221MK

here 25x Elko radial 220uF 200V 10000h @ 105C RM5 12,5x40mm ; RoHS ; EKXJ201ELL221MK | eBay

Br Walter

Thanks a lot.
Theese will do the trick., I think.

Quite crowded this PCB. And then the capacitors are in house(nearly)

Just now I am about to match the MPSA42/92 transistors and wait until my cabinewt arrives from Italy. All looking extremely good so far.
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Old 10th February 2013, 02:10 AM   #2123
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Progress is extremely slow here.
Good for me I am not doing this for a living.

But the most components are in place, now I am only waiting for my cabinet to arrive.
Done some math on the heatsinks and discover that I need to help them a little bit.
Too much power, too small heatsink. A beginners error it should have been, but to obtain the best possible WAF I couldn't get the enclosure needed to avoid forced cooling.
Damned.
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Old 12th February 2013, 05:59 AM   #2124
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Originally Posted by nikosokey
Ι will put greater heatsink 320mm x 200 x 40 mm .


'''AndrewT
300 x 200 x 60 would be cooler.
320 x 200 x 80 would be nice. '''

AndrewT is right, when you want to play at a high level for a long time.
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Old 12th February 2013, 09:18 AM   #2125
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I am going for a heatsink of 500X180X60.
Hope it will be suficient.
I also will change the transformer from 2X625VA to 2X1250VA.
Probably by just adding 2X625VA extra.
Otherwise I will not get more than 258W in 8 Ohms.
I must have been sleeping when determining the transformers.
The GM9 is a monoblock opposed to to what I in a weak moment I thougt it to be a stereoamp. Explaining the mishappen with the size on the transformers.
Should really have been at 1500VA+ each channel.
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Old 12th February 2013, 09:41 AM   #2126
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by TANDBERGEREN View Post
I am going for a heatsink of 500X180X60.
Hope it will be suficient.
I also will change the transformer from 2X625VA to 2X1250VA.
Probably by just adding 2X625VA extra.
Otherwise I will not get more than 258W in 8 Ohms.
I must have been sleeping when determining the transformers.
The GM9 is a monoblock opposed to to what I in a weak moment I thougt it to be a stereoamp. Explaining the mishappen with the size on the transformers.
Should really have been at 1500VA+ each channel.
what boards are you using?
output transistors?

stig
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Old 12th February 2013, 11:41 AM   #2127
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Originally Posted by oiphy View Post
what boards are you using?
output transistors?

stig
I am using this board
.Click the image to open in full size.

Three pairs of 2SK176 /2SJ55
Some Tandberg spinoff actually.
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Old 12th February 2013, 12:49 PM   #2128
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Quote:
Originally Posted by TANDBERGEREN
A capacitorbank of 80 470uF will support the four 10000uF on the boards
I also will change the transformer from 2X625VA to 2X1250VA
Three pairs of 2SK176 /2SJ55
I promise you: if anyone is capable of making this amp worse, it's you.
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Old 12th February 2013, 02:22 PM   #2129
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Originally Posted by jacco vermeulen View Post
I promise you: if anyone is capable of making this amp worse, it's you.
Yeah. Who else?
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Old 12th February 2013, 02:29 PM   #2130
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Keep listening!!! I owned 2 Absolutely Gorgeous Tandberg 3016A's and ran them in a Vertically Biamped mode, it was Simply Phenomenal !!! Then I bought Krell KSA 250's and did the same, WoW what a Difference!!! So Keep Listening!!!! LOL )
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