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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 22nd December 2016, 04:56 PM   #21
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Are you going to fit everything to the top plate? Even so, I would suggest having the bottom removable might be a good idea. My type 26 has NO bottom, for ease of access, but I lined the sides with aly foil for screening. Others have used copper foil, but I had the aly!
BTW, what is the circuit for this amp? I have only seen this thread; I assume it is in another thread?
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Old 22nd December 2016, 05:27 PM   #22
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Top plate is 2 piece. Rear portion will have the iron bolted down minus choke which will go inside. All connection's will mount to the rear piece also. Front portion will have the tube cutouts and nothing else. this will be removable to make easy access to pcb.
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Old 22nd December 2016, 07:56 PM   #23
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7 hrs later and we have mucic. FM with a passive volume control. B+ is at 150v, B- 195v. Seems low. Should I change the value of C4? I'm tickled it's a music maker.

Last edited by mkane77g; 22nd December 2016 at 08:20 PM.
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Old 22nd December 2016, 09:02 PM   #24
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If I run the bias @ 20Ma I get 204v B- & 160v B+.
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Old 22nd December 2016, 09:03 PM   #25
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TSE running 45's
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Old 22nd December 2016, 09:04 PM   #26
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BTW I'm running 45's
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Old 22nd December 2016, 09:05 PM   #27
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rainman, sorry
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Old 22nd December 2016, 09:20 PM   #28
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Could the rectifier tube I'm using have anything to do with voltage's. Using 5r4's
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Old 22nd December 2016, 09:24 PM   #29
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BTW, if you are mounting Hammond chokes (which have a tendency to vibrate, I have been advised) to a metal plate, using these rubber mirror screw bushes can help isolate them. Available from your local glass merchant, probably. I find them very effective.
Click the image to open in full size.
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Old 22nd December 2016, 10:49 PM   #30
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Thanks for that
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