Vaic 52B monos

KaDe · 7th May 2008, 10:17 PM

Hi

Does someone on this forum know who might have build this
Vaic 52B monos ?
Lorenzo of Master Sound Italia can not tell...........

- they are for 110 Volt mains -

Klaus

HollowState · 7th May 2008, 10:44 PM

A friend of mine has something very simillar that was a proto type. I have asked him if he knows who made his and will report back when/if I learn more.

Victor

jlsem · 8th May 2008, 12:46 AM

Quote:

Does someone on this forum know who might have build this
Vaic 52B monos ?

I can't say that I know for sure, but they appear to be of Chinese manufacture. Opera Audio comes to mind. The ones in the second picture have transformer covers similar to the Ayon amp, so maybe they are Austrian. Mr. Vaic may have some sort of relationship with Ayon.

John

HollowState · 8th May 2008, 02:35 AM

Hi Klaus,

I'm curious, does Mastersound not know, or are they just refusing to say. Anyway, my friend George here in the states says his were made by Mastersound in Vicenza, Italy. About your amp he said:

"Mastersound in Vicenza, Italy...I'm pretty sure, since it's a Vaic brand amp per the label. (Alesa Vaic was Dr. Rikkardo Kron's business partner) "Vaic" on the label, as far as I know, means R.Kron/A.Vaic joint designs., manufacturing ousourced to Mastersound in Vicenza, Italy. Kron and Vaic never did any manufacturing of amps as far as I know and outsourced it all to Mastersound."

"To be sure ask Bruce Fetherling, brucef(at)acousticdreams(dot)net; Bruce is president of Acoustic Dreams in Springfield, Illnois, the US service company for Vaic amps."

Victor

KaDe · 8th May 2008, 10:27 AM

Hi Victor

The amp in your picture with the round cans is Italian made by Master Sound in Vicenza.
Here is their answer to my pictures:

"The photos that you have sent me are not of a my amplifier. He resembles much , but it is not a my amplifier, for me looks like a copy"

- so I guess they are not very happy that there is a second manufacturer in the U.S. -
I will contact Bruce next.

Thanks a lot !

Klaus

danFrank · 8th May 2008, 04:11 PM

Hi,
I see here there are people talking about the VV52B tube, so hopefully somebody may know the answer here.

What is the optimal filament voltage for the KR VV52B? I have seen anywhere from 5 to 6.3 volts. The curves for this tube were made with a filament voltage of 6.0 volts, so I am assuming that this is what the factory uses.

I always have wondered what the best filament voltage is for these tubes.

Thanks, Daniel

By the way, I cant remember what issue of Sound Practices had it, but there is a picture of a VV52B amp very similar to the first one posted on this thread. I'll see if I can find it.

KaDe · 8th May 2008, 07:50 PM

Hi Daniel

It is in Sound Practices Issue 15.
Grego Sanguinetti runs the VV-52B heaters in his design @ 5 Volt AC.
They are not the amps I have, but you exactly hit my point.....
My amps have the AVVT AV 520B-SL super linear and 6 Volt DC heater supply.
Since they are low on transconductance I am looking for replacement.

- all suggestions welcome -

Klaus

AV520B Datasheet

8th May 2008, 02:35 AM	#4
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Hi Klaus, I'm curious, does Mastersound not know, or are they just refusing to say. Anyway, my friend George here in the states says his were made by Mastersound in Vicenza, Italy. About your amp he said: "Mastersound in Vicenza, Italy...I'm pretty sure, since it's a Vaic brand amp per the label. (Alesa Vaic was Dr. Rikkardo Kron's business partner) "Vaic" on the label, as far as I know, means R.Kron/A.Vaic joint designs., manufacturing ousourced to Mastersound in Vicenza, Italy. Kron and Vaic never did any manufacturing of amps as far as I know and outsourced it all to Mastersound." "To be sure ask Bruce Fetherling, brucef(at)acousticdreams(dot)net; Bruce is president of Acoustic Dreams in Springfield, Illnois, the US service company for Vaic amps." Victor __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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8th May 2008, 04:11 PM	#6
danFrank diyAudio Member Join Date: May 2005 Location: California	Hi, I see here there are people talking about the VV52B tube, so hopefully somebody may know the answer here. What is the optimal filament voltage for the KR VV52B? I have seen anywhere from 5 to 6.3 volts. The curves for this tube were made with a filament voltage of 6.0 volts, so I am assuming that this is what the factory uses. I always have wondered what the best filament voltage is for these tubes. Thanks, Daniel By the way, I cant remember what issue of Sound Practices had it, but there is a picture of a VV52B amp very similar to the first one posted on this thread. I'll see if I can find it.

8th May 2008, 07:50 PM	#7
KaDe diyAudio Member Join Date: May 2007	Hi Daniel It is in Sound Practices Issue 15. Grego Sanguinetti runs the VV-52B heaters in his design @ 5 Volt AC. They are not the amps I have, but you exactly hit my point..... My amps have the AVVT AV 520B-SL super linear and 6 Volt DC heater supply. Since they are low on transconductance I am looking for replacement. - all suggestions welcome - Klaus AV520B Datasheet

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