damn, I was about to post about the adventures of Sakuma-san, a different way of being, worth investigating if you can obtain good IT transformers
Hi!
There is plenty of choice for good interstage transformers, besides the Tamuras which Sakuma uses, there is Tango, Tribute, Lundahl and many others.
Thomas
There is plenty of choice for good interstage transformers, besides the Tamuras which Sakuma uses, there is Tango, Tribute, Lundahl and many others.
Thomas
Hi!
Nothing really new. One of my favorite interstage transformers is still the Tango NC20. Tribute can make something similar. If on a budget, Lundahl has a broad offering of different ITs. They just released a new type. I wrote about it on my website but have not tested it yet.
Thomas
Nothing really new. One of my favorite interstage transformers is still the Tango NC20. Tribute can make something similar. If on a budget, Lundahl has a broad offering of different ITs. They just released a new type. I wrote about it on my website but have not tested it yet.
Thomas
Hi!
Just note the 100 Ohm input impedance. Not many preamps can drive this properly. Sakuma uses Preamps with power triodes and often with power amp output transformers.
Also note that Sakuma is after a certain sound, not necessarily the leats colored and linear design. This amp will certainly not have a wide bandwidth with this arrangement.
I like Sakuma-sans design philosophy a lot and use similar concepts myself. But I'm after a more neutral sound and decent bandwidth.
It's all a matter of your goals in sound.
Best regards
Thomas
Just note the 100 Ohm input impedance. Not many preamps can drive this properly. Sakuma uses Preamps with power triodes and often with power amp output transformers.
Also note that Sakuma is after a certain sound, not necessarily the leats colored and linear design. This amp will certainly not have a wide bandwidth with this arrangement.
I like Sakuma-sans design philosophy a lot and use similar concepts myself. But I'm after a more neutral sound and decent bandwidth.
It's all a matter of your goals in sound.
Best regards
Thomas
Hi!
I'm not a big fan of the 300B either! I very much prefer the 45 or 801A.
The 300B amp was a customer request. With the 10Y as driver it gives much of the good properties of the thoriated tungsten filament tubes. I liked this 300B amp a lot. It used old manufacture WE 300Bs. Tango interstage and output transformers.
Best regards
Thomas
I'm not a big fan of the 300B either! I very much prefer the 45 or 801A.
The 300B amp was a customer request. With the 10Y as driver it gives much of the good properties of the thoriated tungsten filament tubes. I liked this 300B amp a lot. It used old manufacture WE 300Bs. Tango interstage and output transformers.
Best regards
Thomas
Many thanks for all responses. It seems that 10Y is the tube of choice to drive 300B. Can you all please advise me a most simple 10Y driving 300B push pull schematics?
Hmm, there is not likely a "most simple schematic".
IMO with a (pair of) 10Y driving 300B's in push pull you opt for a high quality design, where cost is not the most important factor.
Lynn Olsen's Amity and Karna amplifier designs are good examples of DHT's driving DHT's.
You may want to investigate using a D3a triode connected to drive your output stage. I believe there are some examples of this over at audiodesignguide.com
I had a schematic worked out for this driver driving a 2A3 PSE but never built it...it looked good on paper....
I had a schematic worked out for this driver driving a 2A3 PSE but never built it...it looked good on paper....
Hi!
Pieter mentioned already: A 300B with 10Y driver is not going to be simple. Filament supplies need utmost care if you want this to be hum free and good sounding.
There are a lot of PP schematics available from Sakuma which you could adapt to your needs.
I'd only recommend such an amp with directly heated drivers if you already have some experience in amp building and budget is not an issue.
Best regards
Thomas
Pieter mentioned already: A 300B with 10Y driver is not going to be simple. Filament supplies need utmost care if you want this to be hum free and good sounding.
There are a lot of PP schematics available from Sakuma which you could adapt to your needs.
I'd only recommend such an amp with directly heated drivers if you already have some experience in amp building and budget is not an issue.
Best regards
Thomas
My Parallel 300B circuit. I started out using a 6SN7 connected in parallel to drive them but it did not sound very good....maybe bad operating point don't know. Then I went to a 6V6 triode connected...then to the 6L6 version (7027A). This circuit represents a lot of listening. The grid chokes on the 300B's are definitely worth a try. They are going cheap on Ebay right now. As far as the 7027A goes I just had a bunch.
Attachments
D3a's or 6SN7's: it works, but for quality designs you need more headroom, especially in driver stages. Not surprising that the 6L6 driver resulted in better sound.
How much head room are you using in your designs...specifically. I am interested.
Hi!
Fully agree with Pieter on the headroom. I shoot for a minimum of 6dB. Often even 12dB!
Best regards
Thomas
Fully agree with Pieter on the headroom. I shoot for a minimum of 6dB. Often even 12dB!
Best regards
Thomas
Hi!
For example if a driver needs to deliver 100VRMS to driver the output tube to full power, I select a driver tube and configuration which is able to deliver at least 200V. But this is just a rough rule of thumb and my personal preference.
Thomas
For example if a driver needs to deliver 100VRMS to driver the output tube to full power, I select a driver tube and configuration which is able to deliver at least 200V. But this is just a rough rule of thumb and my personal preference.
Thomas
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