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Jumping into tubes

vintage 5.0 said:
Why not look at a Dynaco ST 70 plenty of power and you can find all kinds of parts later to upgrade. One of the most popular amps ever made and for a good reason.
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I'm saving up for a Dynaco now. I couldn't find one in my price range in the condition I wanted at the time. I keep hearing great things about them!
 
roline said:
Why not brew your own? I did a 35watt /channel PP sweep tube amp for under $350 and it is still my favorite amp. (In wood chassis)
Currently working on a little PP 6LU8 amp with Bogen output iron. As many scrounged components to keep the cost down. Output iron looked real rough until cleaned up and painted, still need to stuff into a chassis. Currently less than $200 invested in this one. I print out the paper PCB design and put on top of the florist foam to allow me to verify spacings prior to fabing the PCB. The prototype on the right was the original concept and the final version allowed for fixed or cathode selected bias, UL, Triode or Pentode configuration on the output tube.
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Once I have more knowledge than I do now I would absolutely love to do my own!
 
This Yaqin just blows my mind! Other than Megadeth and Pantera I have no clue why ever owned an SS system. (Disclaimer... My Yamaha and Klipsch are NOT for sale..)
 
Great amps aren't they? Heck, the binding posts alone retail for $57.00 each and there are 6 of them on the amp.
 
I started another PCB design for 17JT6 and 17GB5 output sweep tubes. It is based on the PCB that I designed on Kegger's ST70 idea using 6L6 family of tubes. I changed the output tubes from Octal to Novar, there are a few jumper selections between the 17JT6 and 17GB5 tubes, and the GB5 family are top caps.
I found 17TJ6's for under $2 so There would be $10 worth of tubes in the design. SO 17watt output sweep tubes should be able of providing 30+ watts/channel. I contacted Edcor to see if they would do a custom multi-taped heater transformer to provide taps for 13v,17v and 21 volt heaters so the less desired and still available sweep tubes could be easily used. B+ was based on 400Vdc with a bias tap for adjustable fixed bias.
My current project is a 6LU8 PP amp at 400VB+ with 6.6K 30watt Bogen iron. A surprising amp with 14 watt sweep tubes, and some do start to glow at 14 watts.
Available iron from Edcor http://www.edcorusa.com/p/434/cxpp30-ms-5k for $60 each and a power transformer should be had for under $100. An amp should be able to be built for around $300-350.
I'll add to the post when Edcor responds and I etch the PCB, toner transfer.
 

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heath2832 said:
Great amps aren't they? Heck, the binding posts alone retail for $57.00 each and there are 6 of them on the amp.
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Loving it more each day! I'm using my luxman cdp and my realistic lab 400 tt. I have a cheap phono pre until I find a better one.
 
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