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Okay thanks since I asked I figured out what it was in this amp for, it was a preamp for a phono so it is,nt really doing anything in this amp as I am using it but I will check out the links you sent. This fun stuff,I can,t seem to get enough of it.As you said I suspect it does,nt make allot of difference on allot of these tubes,and more to the talent of the guy playing the guitar or harp.I am going to try getting a little less power to the output tubes to try to cut down on feedback,Almost every amp I have feeds back at low volume when I play my harp through them. they sound good playing guitar through them. But I am not really a guitar player. I am learning I have been playing a harp for 30 years. Next month will mark my first year of playing guitar. I am doing this mostly for something to do. The best sounding harp amps I have used have the tube line up of 2, 12AX7,s.2, 6V6,s and a 5Y3, but that is just me and those amps feedback to easy unless I am a long way away from the amp.that said I only play at my house now so I am looking for a way to get the same sound without the feedback thanks again I will check out these links.Comment
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Hey look pretty pictures and schematic
<img src="http://i802.photobucket.com/albums/yy303/guitarded1000/kent_zps2c60ade4.jpg">
<img src="http://i802.photobucket.com/albums/yy303/guitarded1000/Amps/kent2_zpsf4a496c9.jpg">Comment
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Funny, the heaters in my amp are wired in series. I am trying to isolate the loud hum it makes by yanking the tubes starting with the preamp.
That method doesn't work too well!Comment
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That is how the manufacturer got away without having a power transformer, they used tubes and resistance that summed up to the wall voltage (35+50+12+voltage drop over resistor sums to 110-115 volts or so). Break the chain, no heater current flows.Originally posted by DaveDavidson View Post
If you are new to these things, please read all the caveats about transformerless designs (search the forum). Be advised, the chassis can sometimes be hot on these things depending on how they are set up.
The hum is almost certainly the multi-section electrolytic filter capacitor. If those are your pictures in the previous post then it looks original. You could prove it by looking at the ripple, but I think you know what you are going to find.Comment
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Hi. Thanks for the replay.
I have a background in tech and engineering and have done a lot of basic work on "good" tube amps!
It took me a while to connect the earlier responses in this thread to the idea that the wall current goes right into the amp without a transformer! I would have picked that up eventually. It seems to me that this cab and chassis is a good candidate for a 50's Champ conversion!
It kooks so cool though!Comment
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