Yamaha 2SK77 with First Watt design? - diyAudio
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Old 31st January 2014, 04:56 AM   #1
Bungles is offline Bungles  United States
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Default Yamaha 2SK77 with First Watt design?

Hey guys I'm brand new to DIY audio but been enjoying vfet gear for years. I own a Yamaha B1 and a B2, and have an extra pair of Yamaha 2SK77's that I was saving as a backup to my B1. That is until I read the 6moons articles about the First Watt gear. I want to build an F3 but I was also wondering if my old Yamaha VFETS might have some use in a project like this. Thanks in advance for any advice or direction.
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Old 31st January 2014, 08:01 AM   #2
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that's easy - upper half of F3 , lower half of M. Rothacher's L'Amp

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have you any datasheet for 2SK77 ?
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Old 31st January 2014, 04:15 PM   #3
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I do not. I purchased them from a guy who was parting out a B1.
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Old 31st January 2014, 07:15 PM   #4
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Is this what you mean by datasheet?

http://www.google.com/url?sa=t&rct=j...KvYKZgL0GayTVQ
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Old 31st January 2014, 07:25 PM   #5
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this is pretty much all I have

blur

though , I think enough for first tests
Attached Images
File Type: jpg 2sk77_data.jpg (70.9 KB, 534 views)
File Type: jpg 2sk77specs.jpg (88.9 KB, 531 views)
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Old 8th March 2014, 10:27 PM   #6
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I think the L'Amp will be my 2nd project. I'm going to cut my teeth with an Aleph J. Ordered all the parts last night. I do have a pair of 18lb each transformers from a Yamaha B1 I bought for parts. I was wondering if you thought they would go well in an Aleph J build or if you can think of a better application for them.
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Old 8th March 2014, 11:05 PM   #7
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by they you mean on Yamaha B1 xformers , or 2SK77 ?
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Old 8th March 2014, 11:06 PM   #8
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xformers. I have collected a few extra parts over the years. 2sk77's will go into the L'Amp
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Old 9th March 2014, 12:18 AM   #9
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for Aleph J you need secondaries of , say , 2x16Vac to 2x24Vac , without altering schematic

so , if B1 xformers are covering that , then OK
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Old 9th March 2014, 01:30 AM   #10
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It has 2x35Vac and 2x27Vac.
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