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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 12th April 2010, 04:55 PM   #41
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I can listen the sonic features for both Mcap and Jensen capacitors within this 300B amplifier.

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Old 13th April 2010, 04:26 PM   #42
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We selected Erse 100F 100v 10% D.F. non-polarized electrolytic capacitors as cathode capacitors for 300B because the sound of Erse electrolytic caps is natural.

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ERSE - Non-Polerized Electrolytic Capacitors

The cathode resistors for 300Bs used are Dale 50W 1K ohms (next to Erse cap).
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Old 13th April 2010, 07:42 PM   #43
joaquim is offline joaquim  Sweden
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Oh-yeah! A 50W resistor, it shouldn't cause any problems, it want neither get warm nor worn... . I measure all cap's I use, whom will carry AF, takes a bit longer to get started, but you'll get it "back" when you're finished the amplifier. 5% tolerance, is very nice for a non-polarized electrolytic cap... And with the 1k resistor the roll off frequency is 1.6Hz.... But I've never used Erse cap, I've spent loads of money on styroflex/polyporpylen(<-- in Swedish), MKP Mundorf MCap, about €40 for a 100/100V, typical +/-1.5%. So I'm gonna checkout and try the Erse Cap, since it's much cheaper, and if it sound okay too, then, bye, bye Mcap... Although I will keep using them(Mcap) in passive filter designs, for speakers, I've tried nearly hundred different brands, but none, has ever come close to Mundorf's Mcap's.
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Old 14th April 2010, 06:06 AM   #44
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MKP Mundorf MCap, about €40 for a 100/100V, typical +/-1.5%? You can try Mcap Ecap Elko bipolar cap for 100uF/100VDC. They are not too expensive. The prices of Erse capacitors are low and are worthy to try.
Have you tried Jensen caps?

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Old 15th April 2010, 04:25 PM   #45
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These are two stages filtering for power supply, Japanese Matsushita 33uF/450V and Nippon Chemicon 180uF/450V electrolytic capacitors.

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Old 18th April 2010, 02:26 AM   #46
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10H/200mA choke was built-in the 300B amp.

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Old 6th May 2010, 09:10 AM   #47
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Further information. The wires for connection of audio section are Neotech AWG22 UPOCC copper hook-up wires. Neotech is a famous cable manufacturer for audio in Taiwan. UPOCC copper is made by Neotech.
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Old 6th May 2010, 04:21 PM   #48
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The quality of solder is very important to build tube amplifier. We selected Mundorf M-solder silver/gold solder this time.
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Old 15th May 2010, 02:04 PM   #49
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Japanese Noble power switch, Alps 100K carbon film volume potentiometers and UK RS silver plated selector were used in the 300B amp.
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Old 21st May 2010, 02:35 PM   #50
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The 300B amplifier is playing at the uses's home. He uses ipod with DAC as signal source. Nice sound.
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