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Old 5th May 2006, 05:25 PM   #11
i_should_coco is offline i_should_coco  United Kingdom
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Yes, and 69V of that 425V is cathode bias, so there's only ~350V across the tube itself. It's fine.

Love your attention to detail!

Cheers,
Pete
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Old 5th May 2006, 07:38 PM   #12
jayme is offline jayme  United States
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Looks very nice!

I've been looking for a good solid SET monoblock design to build for my next project...and I just bookmarked your picture page...

Why did you choose the L63 in place of the first 6J5?
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Old 5th May 2006, 07:54 PM   #13
Merlinb is offline Merlinb  United Kingdom
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That's a fantastic looking amp!
Few questions:
Why did you use rubber grommets on the valve sockets?
Why did you use carbon resistors and not metal films?
Did you put a base-plate on or is it permenantly 'open' underneath?
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Old 6th May 2006, 07:48 AM   #14
peppennino is offline peppennino  Italy
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Quote:
Originally posted by jayme
Looks very nice!

I've been looking for a good solid SET monoblock design to build for my next project...and I just bookmarked your picture page...

Why did you choose the L63 in place of the first 6J5?

It's electrically the same tube... You can use L63, 6J5G/GT, CV1067 and other triodes without changes.

Ciao
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Old 6th May 2006, 07:48 AM   #15
peppennino is offline peppennino  Italy
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Quote:
Originally posted by Geek
Nice work!

How on earth do you get the dovetails right? I have a dovetail bit for my router and always manage to scew it up

Completely handmade!


Quote:
Originally posted by Giaime
Ciao Vincenzo!!!

Can you tell me where you get the transformers, tubes, those big cromed capacitors, etc?

Thank you very much!

Ciao! In Italia RS Components has the whole Allied catalogue, so you can have in a few days the ASC capacitors that I used. You can also find them at Olimpia Audio...

PTX is handmade by Novarria and OTX and choke came from Tubetown, in Germany..


Quote:
Originally posted by ttan98
beautiful amp!!!!

I don't want to sound negative, the B+ @ 425VDC on the 300B is too much I believe that will reduce the the reliability of this EXPENSIVE tube....At this voltage you will only gain 1-2 watts extra...

B+ voltage - cathode voltage = plate voltage!

Thanks to all for the kind words!! Ciao
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Old 6th May 2006, 07:55 AM   #16
Giaime is offline Giaime  Italy
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Quote:
Ciao! In Italia RS Components has the whole Allied catalogue, so you can have in a few days the ASC capacitors that I used. You can also find them at Olimpia Audio...

PTX is handmade by Novarria and OTX and choke came from Tubetown, in Germany..
[/B]
Thank you! Yes I know Silvano from Olimpia Audio very well

Why OTX from Tubetown and not from Novarria? Have you ever tried OTXs from Novarria? And what about the PTX, how are they?
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Old 6th May 2006, 09:54 AM   #17
peppennino is offline peppennino  Italy
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Quote:
Originally posted by Merlinb
That's a fantastic looking amp!
Few questions:
Why did you use rubber grommets on the valve sockets?
Why did you use carbon resistors and not metal films?
Did you put a base-plate on or is it permenantly 'open' underneath?

300Bs are narmally quite microphonic. Grommets aid to insulate the tube mechanically from the cabinet.

I prefer the sound of carbon resistor. I selected each pair of res from a lot of ten in order to match the values.

I use a silver ground buss, the top plate is connected to it only in a point: a screw near the first cap after the choke.


Quote:
Originally posted by Giaime


Thank you! Yes I know Silvano from Olimpia Audio very well

Why OTX from Tubetown and not from Novarria? Have you ever tried OTXs from Novarria? And what about the PTX, how are they?
Because I knew the quality of the Hammonds (volevo andare sul sicuro) and also because they have a stunning quality/price ratio... But I know a friend of mine that built the same amps with custom Novarria "C" cored OTX with great results!

Ciao
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Old 6th May 2006, 09:54 AM   #18
peppennino is offline peppennino  Italy
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Quote:
Originally posted by Giaime


And what about the PTX, how are they?
Custom Novarria handmade: a STUNNING piece of iron!!
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Old 6th May 2006, 10:16 AM   #19
peppennino is offline peppennino  Italy
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Quote:
Originally posted by jaymanaa
Will any quality brand (Mars, GE, etc.) oil filled motor run cap do nicely, or are there certain types or brands to look for.

I'm sure it will. I've chosen ASC capacitors because they are in production and a fresh cap is maybe more reliable than a NOS... It depends of the condition of stockage.
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Old 6th May 2006, 10:18 AM   #20
Giaime is offline Giaime  Italy
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Thank you very much!!!! So you ordered Hammonds from Germany instead of Italy, was there a big difference in price?

Sorry for the many questions, but you know... a cap can be bought and tested, output transformers can be bought once, I don't have the money to try Novarria, Hammond, etc etc...
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