The Valhalla power amplifier project

[jane]

Originally posted by stalker
Jane i was looking at your schematic and liked the way you get your bias voltage. I need also -140 for a PP 6v6 i am building. If i copy your idea i wouldn't have to search for a 120 ac transformer, but i am not sure if it will work in my amp. Here's the schematic:

http://www.audiotropic.net/Projects/mmPow.html

I can't see any reason why it shouldn't work in your case. 120:6.3v transformers are both highly available and often inexpensive.

[Cassiel]

120:6.3v transformers are both highly available and often inexpensive.

Yes, they are. Thanks for the info. Great amp you're building.

[jane]

Here is a pictures from the inside with some parts installed:

1: Black Gate filer caps bank
2: Tamura 14VDC heater transformer
3: Brackets for JJ filter caps
4: HEXFRED rectifiers
5: Voltage regulator for 12VDC heater.
6: Socket for soft start relay.
7: IEC 230v input
8: Octal socket for power output (2x6.3VAC, 12VDC, 560VDC, GND)
9: On/Stby LEDs
10: On/Stby switch
11: Power resistors, soft start.
12: Main fuse
13: Terminal strips
14: Stiffening

[Peter M.]

Originally posted by aletheian



Yeah, the translator translates "tubes" as "pipes" and "film" as "movie" prety funny, but for the most part I can figure it out.

I have some friends from Norway. Their sense of houmer is strange. They don't understand why hyperbolie is funny, and they take sarcastic statements as literal. So if they do something extrordinary and I say "man, that sucked" as a joke... being funny beacuse it is obvious that it did not suck, but rather it was very good. In America, that is funny, but they get insulted until you tell them that you were joking.

Seeing Norwigans watch "The Simpsons" was one of the funniest experiences of my life. They just stared at the TV and shook their heads.

WHAT DO YOU MEAN NORWEGIANS DON`T UNDERSTAND SARCASM???
I AM SO DEEPLY INSULTED

[Peter M.]

Jane,
That is a cool looking amp, how does it sound?

Regards,
Peter

[Cassiel]

how does it sound?

aletheian was right, norwegians are funny, how does your chassis sound Jane?

[Peter M.]

I bet the THD is extremely low...

[Bandersnatch]

Hi, I just can't get excited about another version of the 60's commercial amps. Loop NFB, Class AB2 operation...nothing all that special. Sort of like a Heathkit W6M. At least the Heathkits go for about what it would cost to buy the 16431 OPTx for.

May I suggest not selling to the same power hungry folks who will see a bigger number in the SS offerings, and go for instead those who would pay real money for an amp which delivers that which cannot easily be found.

Just my opinion, and I am sure it will sound OK. For the money you'll need to charge, I'd expect a bitmore than OK though.
cheers,
Douglas

[dr._sleep]

Jane:

Speaking of Norway and just for grins, here's a picture of my son with our 6 toed, double jointed, Puffin hunting Norwegian Lundehund on the lake....

Nice amp project, where and how much $$ was that chassis work?
dr._sleep

[jane]

Originally posted by Bandersnatch
May I suggest not selling to the same power hungry folks who will see a bigger number in the SS offerings, and go for instead those who would pay real money for an amp which delivers that which cannot easily be found.

Maybe I misunderstand your suggestion, but I’m not building amps for sale, it is a hobby project.