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I'll get a pic when I get back from hunting. ...
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To put a period on this project, I did some checking and couldn't spot the problem. Fortunately, I have a great tech in town and dropped it by his shop....
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After rewiring the grids, I put tubes in the amp and fired her up. No smoke, no smell... and no sound. I'm going to run back through the solder joints,...Last edited by Travst; 04-04-2012, 02:13 PM.
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Thanks Bruce. It's an old thread that I revived after setting the amp aside for a few months to work on some other projects. I'll make sure to test as you...
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Standby was on when I first tested. I can't remember if I measured again with it off. What concerned me was getting 400+v at pin 6 on the preamp tubes....
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I've been working on this build and started testing the completed amp prior to installing the tubes. Everything looked pretty fair with only a couple of voltages...
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Hey Bruce, thanks for responding. The choke is a Weber/Heyboer unit, Choke for Tweed Fenders. 5-8H @ 200ma, 125 ohm. As noted above, the PT and OT are...
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I was temporarily distracted by fixing up an old Reverberocket, but am back on the case now. A couple of progress pics:
...
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Saved again. I have it wired correctly now and have moved on to heater wiring. The board is built and wired, so I'm getting close.
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Ah, got it now. I'm glad I waited for a response. I am always checking my assumptions, better to be cautious, I think. Thanks!
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I had one more question that I neglected to bring up. On the PT, the black wire is described as "common primary". After thinking on it and doing...Last edited by Travst; 07-04-2011, 04:23 PM.
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Thank you, Tom. I did mean the 6.8k resistor, and I do plan to put in the bias pot. Your explanation made everything clear.
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Another question, just to make sure I have this right. On the PT, I've noted my assumptions and questionables:
Power Transformer
Black=...Last edited by Travst; 07-03-2011, 07:31 PM.
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Thankee, Scott. Obviously, I didn't catch it either. As for the choke, I settled on the Heyboer from Weber... 5-8H @ 200ma, 125 ohm.
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After buying the Ballentine transformers described above, I have been slowly working on this project, but got sidetracked for a while with a TDPRI competition...Last edited by Travst; 07-03-2011, 04:45 PM.
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Thanks, Scott. These seem like nice units, so I'll see if I can make them mine.
John
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I have a chance to buy some Ballantine transformers from an old theater amp. The specs are as follows:
Power Transformer
Black= Common...
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Excellent points, Tom and good advice that I'll take note of. I have read quite a few threads that agree with your thoughts and it makes perfect sense to...
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Yes, I thought the Supers had smaller iron as well, but MC seems to recommend the 40/50 watt transformers. I wouldn't mind finding a match in the MC line...
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