My new Circlotron OTL tube power Amp. - diyAudio
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Old 19th November 2011, 11:13 PM   #1
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Default My new Circlotron OTL tube power Amp.

First of all congratulatios for this great forum with those wonderful threads and ideas . I would like to introduce to you , my new tube power amplifier ( its not complete yet , but soon it will be ) , wich is an OTL Circlotron topology with the PL36 tubes . I use the following tubes for each channel , one EF184 or EF183 for the input stage / phase spliter following by one PCC85 as first differential gain stage following by two PCL82 as second differential gain stage ( the triode sections ) and the pentode sections as cathode follower to drive easely the output tubes wich is 10 PL36 five per each rail . Here is some fotos .
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Old 19th November 2011, 11:47 PM   #2
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Two other fotos .
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Old 20th November 2011, 01:40 AM   #3
ke4mcl is offline ke4mcl  United States
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wow! thats alot of heat!
nice build
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Old 20th November 2011, 02:44 AM   #4
Bigun is offline Bigun  Canada
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Impressive...

It's quite a bit of glass - can't wait to hear your impressions on how this baby sounds !
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Old 20th November 2011, 02:50 AM   #5
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A truly amazing project.. I will be watching for final pics and performance comments.
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Old 20th November 2011, 03:01 AM   #6
Tajzmaj is offline Tajzmaj  Slovenia
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Very nice ...and diy. I like it very much.
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Old 20th November 2011, 04:02 AM   #7
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Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage.
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Old 20th November 2011, 08:05 AM   #8
banat is offline banat  Serbia
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Very nice OTL amps project !

Best Regards !
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Old 20th November 2011, 04:12 PM   #9
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Thank you all guys for your comments .
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Old 20th November 2011, 04:34 PM   #10
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Quote:
Originally Posted by HollowState View Post
Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage.
Yes you have right , the grid stopper resistors its better to be closer to the tubes , but in this case the driver stage have very low output resistance because it is a cathode follower and will minimeze any unwanted effect . The filaments of the PL36 is 25V 0,3A for each one and the 5 tubes need 1,5 A wich is not heavy current , but i agree with you that it is better to connect it like you say if we have tubes like EL36 or El509 or other tubes wich have big reguirements of currents . In the past i use to connect every tube filaments with sepsrate cables , in this amp i do it for simplicity because there is too many tubes .
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