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回覆 (411): 6C33C - Is it the best?
Welborne, photo is the 6C33C-B I am about to place order. It comes with orginial factory sealed box from Russia.  
 
All have date code, Purple OTK stamp and purple batch number. Plus shipping and insurance, roughly US$35 each.  
 
Upon arrival, I will test them and perform the run in procedure. The seller except refund.  
 
bobui
13-07-29
09:05:55
回覆 (410): 6C33C - Is it the best?
6c33- Bobui, I sm looking for a good spare pair too, count me in! One or two pairs would do.
Welborne
13-07-27
14:04:13
回覆 (409): 6C33C - Is it the best?
On practice too. I have yet to hear a power tube as all round as the 6C33C-B.  
Been using this tube for 10years and there is no alternative.  
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Good taste! Best taste! I am looking into getting a few more 6C33 as spare. Like to join?  
 
Ah! kindly keep your patient high on several other good tubes. Namely VT25, 6B4g/2A3 and 811-3 or 811-10. The 811-10 in PPP can drive your pricy speakers to satifaction! Lor! Well, I beleive so!  
 
 
 
bobui
13-07-26
22:04:57
回覆 (409): 6C33C - Is it the best?
No complaint except too hot to run. So far the best sounding tubes I have come across.
dkyyu
13-07-26
17:56:39
回覆 (408): 6C33C - Is it the best?
 
' On paper, 6C33C is almost unbeatable '  
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On practice too. I have yet to hear a power tube as all round as the 6C33C-B.  
Been using this tube for 10years and there is no alternative.  
 
 
 
 
kh33
13-07-26
17:24:53
回覆 (412): 6C33C - Is it the best?
Two pairs of 6C33C per channel offer you no less than 120Watts. Three pairs can easily approach 200Watts.  
 
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Two pairs of 6C33C per channel in push pull with output transformer offer you no less than 120Watts. Three pairs can easily approach 200Watts.
bobui
13-07-26
13:40:42
回覆 (411): 6C33C - Is it the best?
Dont mention it! Just humble sharing lor!  
 
The thing is if what I said apply to most 6C33C in the market. How on earth a normal happy go go hi fi high hand got to getting a valve burn in tool tailor for warming up a few 6C33 every now and then.  
 
Personally, I do not like OTL. Not valve anyway! Two pairs of 6C33C per channel offer you no less than 120Watts. Three pairs can easily approach 200Watts.  
 
Powerful enough for you?  
 
bobui
13-07-26
13:38:42
回覆 (410): 6C33C - Is it the best?
Good to know, thank you for this info c-hing.
Cadiver
13-07-26
13:16:17
回覆 (409): 6C33C - Is it the best?
Some people say 6c33c is a hit or miss, both the machine & the tubes.  
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Bought six 6C33C a few years ago. Put them on a test bench at roughly 200V, 150ma which is about half of its max power. First valve went smoke right away. Then I said to myself. "May be just not my lucky day lor". Insert a second 6C33C. Wah! Cracking noise right away. Off Off! Then I said to myself, "What the hell? Lucky I wasnt going to propose to my girl friend today!"  
 
Since then, I pre-heat the faliment for about an hour before applying HT. And I would start with a very high negative bias to give time for a very slow and gradual raise on the anode ma. So the valve begin with roughly 40 ma. Reaching 200ma only after a few hours.  
 
No more cracking noise and smoke! This pre-heat process only needed to be exercised one time for brand new out of the box valve who has never had the chance to met a MIG-16. Once the valve has been under proper working condition. No such troublesome process required. Just use as what you normally would on your amp.  
 
bobui
13-07-26
10:03:04
回覆 (408): 6C33C - Is it the best?
 
Some people say 6c33c is a hit or miss, both the machine & the tubes. I am very afraid of getting one in which I kind of want one too. The 90's B&K were very popular in the US, sold many. Joule Electra 6c33c OTL had be droooool for a long long time but if the tube is not consistent & reliable & OTL ... Oh ....
Cadiver
13-07-26
01:24:57
回覆 (407): 6C33C - Is it the best?
most people know I just love 6c33c's sound...^^  
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Good choice of valve. You have taste la! On paper, 6C33C is almost unbeatable.  
 
I am currently working on the copper chassis which has an identical measurement as my SV811-3. In mono blocks config. The 6C33 will be operated at roughly 200ma, 220V. Driver tubes would be E283cc and 12GN7 in mu-follower setting. Tango output. Seperate c-core faliment transformer. Fixed bias la, of course.  
 
Once the chassis ready which likely to be by end of next week, the soldering only take me another few days.  
 
bobui
13-07-25
23:03:11
回覆 (406): Completion of my Svetlana SV811-3
oh...6c33c....I am curious what that would be....most people know I just love 6c33c's sound...^^
Welborne
13-07-25
20:19:25
回覆 (405): Completion of my Svetlana SV811-3
Perhaps, by then, you phono amp will be in nice chassis and in full swing too!  
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well you know these babies are waiting 8^)
daiwok
13-07-25
10:14:13
回覆 (404): Completion of my Svetlana SV811-3
Max for a pair in full wave is 2,500V, 500ma!  
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Now, that's a good start & it is going to satisfy the power requirement of 95% tube power amps on earth.
Derek2A3
13-07-25
09:58:44
回覆 (403): Completion of my Svetlana SV811-3
simply gorgeous looking! but no tube rectifier?  
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Now you talking! Very good question indeed.  
 
Two transformers are hidding underneath the surface and there simply no more space to contain the two large caps inside the chassis.  
 
The PPP SV811-10 which will be coming near you in about two months would be using tube rectifier. In fact, a pair of these. See the size compare with a Mullard GZ34?  
 
One single tube contains only one anode. Two needed for full wave. Max for a pair in full wave is 2,500V, 500ma!  
 
bobui
13-07-24
18:14:06
回覆 (402): Completion of my Svetlana SV811-3
simply gorgeous looking! but no tube rectifier?
Derek2A3
13-07-24
17:51:26
回覆 (401): Completion of my Svetlana SV811-3
I built them in small footprint for one big reason, friends can take them away to try out lor!  
 
Take them away if you want to have a go but please give me a few weeks to have my 6C33 ready first. Perhaps, by then, you phono amp will be in nice chassis and in full swing too!  
 
I have high hopes on my upcoming 6C33 SE. In terms of spec for even just audio, the 6C33 beat the SV811-3 by thousands of miles but when it comes to valve build quality, reliability and consturction. I perfer the SV811-3 or 811-10 lor!  
 
bobui
13-07-24
17:47:48
回覆 (400): Completion of my Svetlana SV811-3
love to test !!! I can muster up a pair of speakers to handle such high power !!! @@
daiwok
13-07-24
17:37:27
回覆 (399): Completion of my Svetlana SV811-3
6C33C SE, 15W dual mono coming in a few weeks!  
 
bobui
13-07-24
17:21:27
回覆 (398): Completion of my Svetlana SV811-3
After a week of run in, tweak and circuit adjustment. Here my Svetlana SV811-3 singing nicely.  
 
You have seen some of the test bench results. My listening comments below for sharing.  
 
1. The sound stage is not as forward into your face as my similar constructed PX25 with a single EF37A/6J7 as driver stage. The mu-follower driver stage in the SV811-3 works as a local feedback circuit which offer a deeper sound stage at the expense of a more open forward imaging sound.  
 
2. The resolution is way better than my PX25.  
 
3. Bass has better controlled.  
 
The SV811-3 is operating at 80ma, 650V.  
 
 
 
bobui
13-07-24
17:15:21
回覆 (397): Hi Fi married Cycling
Can HI Fi really mix well with Cycling?  
 
See picture below.  
 
http://wilson-benesch.com/2013/06/wilson-benesch-take-on-the-tour-de-france/  
 
Wilson Benesch has daily update on Tour de France! My next DIY project is to spray my Wilson Benesch Act2 arm and table into YELLOW lor! Ah!
bobui
13-07-18
10:45:13
回覆 (396): 20KHz Test tone!
Here is my KT88/TT21 Push Pull at 20KHz connected in triode mode with zero overall feedback. A touch better than the 811-3 SE at the same square wave frequency, right?  
 
Both amps use Sowter output transformers.  
 
As for listening, the 811-3SE has a smoother treble extension without feeling any lost in high frequency energy or details!
bobui
13-07-15
22:24:33
回覆 (395): Brothers in arm!
not sure if the UTC output might be the possible offender for poor high response  
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The UTC is power transformer. Sowter is the output.  
 
If compare with my PX25 SE using Tamura cow, the 811 is way better la! The PX25/Tamura has an even sharper up hill curve at 20Khz. Meaning there is greater loss of high frequency output!  
 
From my humble experience, its not unusal to see curve looking like that in no overall feedback SE lor!  
 
bobui
13-07-15
12:11:15
回覆 (394): Brothers in arm!
For the record, a 20Khz test tone on my KT88 push pull amp prove to be in much better resemblance to the orginal wave  
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No surprise! If distortion is all you are after, PP is the absolute winner.  
 
Back to your SE 811, not sure if the UTC output might be the possible offender for poor high response, as you know those vintage output trans rarely perform adequately on both ends, more so on the high side in SE situation.
Derek2A3
13-07-15
11:21:37
回覆 (393): Brothers in arm!
but the 20K looked more like kinked sine waves! Any solution??  
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It looked much better when I applied an overall feedback but then listening test tells me that with feedback, the sound is a lot more compress and shut in.  
 
I also did a test on 40Khz and find no oscillation.  
 
For the record, a 20Khz test tone on my KT88 push pull amp prove to be in much better resemblance to the orginal wave form even without overall feedback.  
 
bobui
13-07-15
11:02:12
回覆 (392): Brothers in arm!
20Khz square wave  
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The 50Hz square wave is acceptable to me, but the 20K looked more like kinked sine waves! Any solution??
Derek2A3
13-07-15
09:30:40
回覆 (391): Brothers in arm!
Bench Test 3:  
 
Here the amp tested at 20Khz square wave. You see the square has become the "Alps for the tour the France"! Thats kind of typical for Single Ended. Meaning there is a dip and the amp can no longer reproduce a true 20Khz without lost!  
 
bobui
13-07-14
19:42:25
回覆 (390): Brothers in arm!
Bench Test 2:  
 
Here showing at test frequency 50Hz. See the slight slop to the right on the square wave. That means the amp has trouble to truely replicate 50Hz without lose/dip.
bobui
13-07-14
19:36:20
回覆 (389): Brothers in arm!
Bench Test:  
 
Screen showing my newly built Svetlana 811-3 on a test bench. Frequency is 1Khz square wave.
bobui
13-07-14
19:33:06
回覆 (388): Brothers in arm!
 
I need at least 3 TTs dedicated to air-bearing linear trackers!  
 
thekong
13-07-09
15:50:16
回覆 (387): Brothers in arm!
I do have over a dozen MONO carts ..... now what I need to do is have one turntable dedicated only to MONO ! and another for STEREO. One for Air bearing only, one for 12 inch arms, one for 9 inch arms ........
daiwok
13-07-09
14:50:06
回覆 (386): Brothers in arm!
>Do you want multi input? <  
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What kind of a question is that?!!!! Of course, at least 3!!!! :-)  
 
thekong
13-07-09
13:49:41
回覆 (385): Brothers in arm!
A switch for mono  
 
A swtich for 20mv input  
 
Do you want multi input?
bobui
13-07-09
12:47:52
回覆 (384): Brothers in arm!
I will have more time for daiwok phono  
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I would like to able to adjust the gain, and possible have a switch for MONO.  
 
Now the maximum load is 20mV ! most MONO are between 5mV to 10mV  
 
The Phono I gave you is based on the SHURE MM phono stage.  
 
thanks Bro !!  
 
 
I have been busy cooking up new recipes for you ^__*
daiwok
13-07-09
12:34:49
回覆 (383): Brothers in arm!
Same apply to internal components, sometimes, the tidy looking wiring may not be the best practice! Just look inside an old tube radio, there is a reason why so many wires and components are crossing each others!  
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I have to agree ! while a tidy plate may look appealing, ultimately it is down to how it tastes ! 8^)
daiwok
13-07-09
12:33:06
回覆 (382): Brothers in arm!
Thanks for all your kind words! Just my little humble sharing!  
 
 
My 9 to 5 is starting to slow down a bit now after the peak seasons. Of course that means I will have more time for daiwok phono, Kong, etc.  
 
bobui
13-07-09
12:19:21
回覆 (381): Brothers in arm!
This is the second time I've worked on copper chassis for my diy creations. More difficult to handle than alumimium and wood.  
 
Chassis:  
When drilling, copper tend to suck in the drill. To drill a hole of let say 10mm, you must take steps and drill several times in gradual expansion. Be extra careful and use a hole punch whenever is possible. I use UK made PRESTO drills.  
 
Implement a circuit:  
Not much more I can share other than what you may have already read from various diyers in the web. Perhaps, this lor! : Do not run signal wire along high voltage wire. Running them in cross section is fine. Same apply to internal components, sometimes, the tidy looking wiring may not be the best practice! Just look inside an old tube radio, there is a reason why so many wires and components are crossing each others!  
 
 
Here is the little brother PX25 and the newly born Svetlana 811-3. The soon coming 6C33 SE is also going to be in the same looking chassis but the PPP811 will be in a much bigger chassis of hammered metal finish.  
 
 
 
 
 
bobui
13-07-09
12:10:48
回覆 (382): Svetlana SV811-3 SE
 
 
堅 !  
 
limage
13-07-09
12:08:14
回覆 (381): Svetlana SV811-3 SE
 
Nice! I would like my VPI stands in this hammered metal finish ! :-)  
 
 
thekong
13-07-09
11:53:19
回覆 (380): Svetlana SV811-3 SE
wow ! very nice ! I would love to have a 801A / VT25 in this kind of format 8^)
daiwok
13-07-09
11:35:02