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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 07 Dec 2010, 20:52 
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Location: Australia
Regulators arrived today, still waiting the power tranni. Mybe tomorrow.

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PostPosted: 17 Dec 2010, 18:12 
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The power tranni finally arrived all 11lb (5kg) of it. Matt: I think you were interested in the resistance of the secondary - 140ohms. I kept my fingers back for this one.
Attachment:
300BTranni.jpg
Today I will try a few layouts for the amp top plate. I have a place nearby which will cut heavy Al plate to size.


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Projects: "Tutu" - 150W Tripath T3 monoblock | "Silver Supreme" - 6L6GC-12AT7 SE UL power amp | "retro-4040" - 40W Chip amp LM3876T
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PostPosted: 17 Dec 2010, 18:23 
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Location: Winnipeg, CANADA
Hi Mark. From where did you source the power transformer?
Cheers

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PostPosted: 17 Dec 2010, 18:39 
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There is a company called AVAT an hour or so drive from my place which specialise in tube trannis. Matt looked over their products and figured there was one which would suit our needs. But they only wind to order so a one month wait. Still expensive compared to Edcor but Edcor didn't have what we needed.

It would have rather it painted. Not sure what i will do here - paint or no paint.

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Projects: "Tutu" - 150W Tripath T3 monoblock | "Silver Supreme" - 6L6GC-12AT7 SE UL power amp | "retro-4040" - 40W Chip amp LM3876T
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PostPosted: 25 Dec 2010, 09:45 
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Joined: 24 Jun 2010, 00:48
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Location: Christchurch, NZ
Hi Mark,

How is the progress so far?

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Dinesh

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PostPosted: 25 Dec 2010, 17:19 
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Still waiting the filament tranni. It IS on its way though. I have the power tranni and really could start layout of the power section. The amp will be in two parts: Power section and amplifier section. Even with the amp section I can now start a layout. Should have something up in the next four days.

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Projects: "Tutu" - 150W Tripath T3 monoblock | "Silver Supreme" - 6L6GC-12AT7 SE UL power amp | "retro-4040" - 40W Chip amp LM3876T
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PostPosted: 25 Dec 2010, 19:51 
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Location: Las Vegas Nevada USA
mwhouston wrote:
There is a company called AVAT an hour or so drive from my place which specialise in tube trannis. Matt looked over their products and figured there was one which would suit our needs. But they only wind to order so a one month wait. Still expensive compared to Edcor but Edcor didn't have what we needed.

It would have rather it painted. Not sure what i will do here - paint or no paint.

I would paint. Just my personal preference. Sand well, PRIME, and paint. I bake my steel chassis in my oven at about 200F to dry the paint fast, but it stinks up the house so be warned your wife might not care for it. :shock:

I got out some parts today to start assembly of my GM70 amp that I started designing several months ago and lo and behold I scratched the %^&* out of it somehow when I moved it so I now need to paint it again.

What are the chances of having a custom tube transformer winding company just an hour from your home??? Like a million to one? What luck.

Are there any manufacturers of tube amp transformers in the US that take small orders other than Edcor - does anyone know?

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PostPosted: 26 Dec 2010, 01:15 
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Actually to rub just one more kilo of raw sea salt into the gaping wound of "at hand tranni winders"-I have two winders within one hour drive. Suffer!

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PostPosted: 27 Dec 2010, 16:08 
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Lo and behold, there is a custom winder in Las Vegas - Electa-Print. :D

I didn't know that until this morning. Their prices are higher than Edcor, but they will build a massive PP output transformer for $380USD.

I asked for a price on an OT with the same specs as an Edcor model and here was a part of the response I got which I found interesting:

"The core size in a p-p type trans is really affected by the power output at the bass end. Wire DCR losses are of no concequences just put up with (them). We can build this very large so it could supply very high power at the low end, or reduce the size and you would use NFB to artificailly produce bass.
The larger, the less NFB needed, also the price increases for large cores.
The reason we do not have p-p models is due to the NFB value which is unknown to the customer and we have to guess for them.
When the bass end is lousy we are blamed so no stock models."

I'm going to write them again and find out just how big the cores are and how much the transformers weigh. I've always been a little "fuzzy" on how PP transformers are rated for power. There are no standards of measurement to make a uniform comparison. Many manufacturers rate the response and distortion at partial power, with no indication of the way the measurements were taken. To me the weight of the transformer has more to do with the power rating than the specs that the manufacturer can manipulate at will.

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PostPosted: 27 Dec 2010, 18:37 
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Its really is hard to find a winder cheaper than Edcor. I paid big bucks for my locally wound unit but Edcor didn't have a model which suited.

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Projects: "Tutu" - 150W Tripath T3 monoblock | "Silver Supreme" - 6L6GC-12AT7 SE UL power amp | "retro-4040" - 40W Chip amp LM3876T
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