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Old 10th April 2011, 08:19 PM   #1
g(f(e)) is offline g(f(e))  United States
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Default finished breadboard project

Here is a pic of my finished project. Initially I had a slight hum which went away when I connected the filament ct to ground. Also, the gain was a little low because I was using a discman with only .7v output. I changed that with a cd player with 2v rms and it is fine. All of the voltages check out and it sounds pretty good. It is only one channel. I posted awhile back about connecting one channel from a two channel source, and took the advice given, by using two 10K resistors to sum the input to one channel. It works well, so I did not try a different way.

Transformer is an old one out of my Grandmother's old Zenith console push pull amp.

Thanks for the help to those that helped me when I had questions. This was strictly a learning project. I am going to start thinking of a different design for the next project.

Tubes used are 5y3, 6SN7, and 6V6. I used the Sylvania RC charts because they had a 250 volt column for the 6SN7. The 6V6 is set at 250V with 12V bias.

Gary
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Old 10th April 2011, 09:10 PM   #2
DF96 is offline DF96  England
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Glad you got it working. Those long leads might create RF instability problems, so watch out for funny noises or distortion which disappears when you move your hands near the circuit!
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Old 10th April 2011, 09:13 PM   #3
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Hi,

where did you get these tube sockets with the screw-terminal-blocks below from? Look great for a breadboard setup

Greetings,
Andreas
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Old 10th April 2011, 09:15 PM   #4
g(f(e)) is offline g(f(e))  United States
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they are relay sockets - I got mine from an electrical supply store in town. Search for relay sockets, mouser, digikey, etc. They are rated for 300V and 10A. Very handy like you said for this application.
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Old 10th April 2011, 09:19 PM   #5
g(f(e)) is offline g(f(e))  United States
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DF96 - I must be lucky because I haven't notice any problems. A friend of mine is an old radio guy and he expressed the same concern. I am sure it is less of a factor with audio, but still a concern. When I started wiring it, I decided it was best just to build it and then debug it. Too many times I over think things, I just wanted to get something built!
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Old 10th April 2011, 09:19 PM   #6
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Quote:
Originally Posted by g(f(e)) View Post
they are relay sockets - I got mine from an electrical supply store in town.
Great idea!

I took the classical way, putting drawing pins into the board and soldering stuff to them... I will post pictures when my board looks a little more crowded than it does now

Greetings,
Andreas
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