| JosM |
Dear Audiofrinds,
Hereby a photo of my home made SE 300B amplifier.
Tubes are 76 (input) 46 (DHT driver) and of course the KR300B. Output transformer is from Sowter (UK)
The 76 and 46 are capacitor coupled and the 46 and 300B have an interstage (Tango NC20) If anyone is interested in the schematic I can send it to you. |
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| sunrise |
| looks very nice.....expensive parts ....i hope it sounds nice.....the power transformer is made by?? |
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| kuroguy |
| NICE. Got another one of those or are you deaf in one ear and don't have any use for stereo? |
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| Salectric |
I am interested in seeing the schematic. Your tube selection is similar to one of the options I'm considering.
Please email to: eicotubes@hotmail.com
Thanks. Dave |
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| JosM |
Hello sunrice,
The power transformer is also from Sowter England. |
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| andyjevans |
This is really the way to go. 300b is a great output, 46 is a great driver. I'd put a 26 or 01A in place of the 76 and a 10Y in place of the 46 but these are just flavours - the basic idea of 46 transformer coupled to 300b is exactly the way to do it.
Gain-wise, the 76 does push up the gain nicely. Subbing in a 10Y for a 46 raises the gain slightly, and you then lose a bit in the first stage with 26 or 01A. But basically you're just about there with fairly sensitive speakers, which you need for a 300b SET anyway. But that does include single drivers like the Jordan, which sound remarkably good.
Andy |
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| G |
Good stuff! Congrats.
Gavin |
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| JosM |
| Hereby the schematic of my 300B amp |
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| kmaier |
Nice clean design, simple and direct. Only one comment: any particular reason you chose not to provide any static loading of the interstage driver (NC-20 secondary)?
Regards, KM |
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| JosM |
Hallo KM,
No not a particular reason. In de specifiction of de NC20 is not recommended to use any.
Regards,
Jos |
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| jazzbo |
| What are you using as the operating point for the 46? What Vp at what Ip? Looks somewhere around 260Vp, -44Vbias at ~20mA. |
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| JosM |
| -Ug = 39 Volt, Ia = 19 mA, Up = 306V |
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