advice on Clementine build

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advice on Clementine build

Postby fiftyfivefilms » Sat Nov 16, 2013 3:17 pm

Hi,
I'm hankering on building a Clementine, but would welcome some advice on moving forward. I have built a Get*set*Go with the 300B mod and it is my best sounding amp to date, I'd like to top that, and I'd like to build a Clementine specific to either a 6550 tube or EL-37 (I've got plenty of KT-66 and EL-34s I could roll in also). so should I build a:

1." Chubby" or an "Ultra"..I'm using efficient "Klipsch Cornscallas"... Advice?

2. the output transformers, for my Get*Set* Go I used Transenders...they were great! but as an alternative I'm curious about Mangnequest Robin hood series, which one would you recommend?
http://www.magnequest.com/robin_hood_series.htm

3. If I did go with Transenders is this one OK? TT-119-OT
http://www.transcendar.com/2.html

any opinions on which would be a better choice, the Magenquest? the Transender? The Edcor?....

Cheers,
Kirk
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Re: advice on Clementine build

Postby gtasound » Sat Nov 16, 2013 6:59 pm

The TT-119-OT you called for is not on Transcendar's web site, using the TT-020-OT 10w 5k in my clementine triode wired KT88,6L6,6550 and KT120 for about a year now and have about 200+ hrs on the OT's and find the performance superb, not having any knowledge about the Magnequest OT's I can not comment on them, but the reputation of Magnequest Robin Hood transformers is excellent so I venture that the OT's are also very good except for looks and price being a little bit higher.
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Re: advice on Clementine build

Postby fiftyfivefilms » Sun Nov 17, 2013 1:37 pm

Thanks for the reply... interesting you didn't see the TT-119-OT it's under 15 watt transformers on the link I provided.
I am still curious about which of the "Robin Hood" series would be appropriate for a "Chubby" or "Ultra" build...
Cheers,
Kirk
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Re: advice on Clementine build

Postby gtasound » Mon Nov 18, 2013 2:57 am

Sorry you are right, I missed it under the 15w 5k OT's, the 10w 5k TT-020-TT has solid output at 20 hz measured having good inductance and the mid and highs are excellent, when no more than 10 watts are required these are superb 10w OT's.
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Re: advice on Clementine build

Postby fiftyfivefilms » Mon Nov 25, 2013 2:42 am

gtasound wrote:Sorry you are right, I missed it under the 15w 5k OT's, the 10w 5k TT-020-TT has solid output at 20 hz measured having good inductance and the mid and highs are excellent, when no more than 10 watts are required these are superb 10w OT's.

Thanks, I've ordered my board from Shannon , I'm going to build an "Ultra"...I'm going to go with Transendar, but I'm not finding the 10W TT-020..I see that model number under 20W ...I'm confused a little,maybe Shannon can clarify:" Shannon what wattage/ model of Transendar do you recommend for an "Ultra" build...

My second question is about the PA 774 transformer...I've done a little research and some say the "new" ones buzz a little, I've got a "real" one in my ST-35 and have had no issues...the Endcor looks great...but oh! the wait.

Looking forward to my build!..
Cheers.
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Re: advice on Clementine build

Postby TerrySmith » Mon Nov 25, 2013 8:16 am

If you want a good power transformer that is quiet an Antek AS-1T300 toroid will work perfectly. You can get the optional case or mount it under the chassis . I've been using these for years now with zero noise and zero problems!
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Re: advice on Clementine build

Postby gtasound » Mon Nov 25, 2013 7:36 pm

Sorry made a mistake in giving the wrong Transformer #, the #'s are TT-012-OT for the 10w 5K no UL OT which is the one I use in triode mode only, the other is the TT-312-OT for the 10w 5K UL OT.
Hope this helps now.
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Re: advice on Clementine build

Postby fiftyfivefilms » Mon Nov 25, 2013 11:19 pm

gtasound, thanks that clears things up!.. I'm going UL so the TT-312 is the one for me. Terry thanks for the heads up on the Antek, I'm going to give that a whirl also...now I'm wondering about an up grade for choke's...Transendar sells three different one's all are the same price, 2,5,10 henry..any thoughts one these?
Cheers,
Kirk
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Re: advice on Clementine build

Postby gtasound » Fri Nov 29, 2013 12:34 am

The 2H 400ma 25 ohm DCR would be my recommendation because of the low voltage drop across the choke also it has over sized current capabilities
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Re: advice on Clementine build

Postby fiftyfivefilms » Fri Nov 29, 2013 8:23 pm

gtasound wrote:The 2H 400ma 25 ohm DCR would be my recommendation because of the low voltage drop across the choke also it has over sized current capabilities
Great, thanks!... I'm going for the 2H...
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Re: advice on Clementine build

Postby fiftyfivefilms » Tue Dec 03, 2013 11:19 pm

TerrySmith wrote:If you want a good power transformer that is quiet an Antek AS-1T300 toroid will work perfectly. You can get the optional case or mount it under the chassis . I've been using these for years now with zero noise and zero problems!
Terry, one question about the Antek, it's rated 300-0-300 and the recommended Edcor is 330-0-330,...Since I'm building an "Ultra" and plan on using 6550's or 6L6's.. wouldn't this lower the B+?....would I/could I need to adjust R-22 to keep the B+ at 300v?
Thanks for your help.
Kirk
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Re: advice on Clementine build

Postby gtasound » Wed Dec 04, 2013 2:00 am

Not having ever used an Antek PT I would say that 300-0-300v is alright having used the same in a Hammond PT and it is sounding fine, the main difference for me was the current capabilities of the Hammond are much higher to supply the power as well as the heater current to the power and driver tubes.
I am in the process of building another Clementine with another 650-0-650 Hammond PT.
Antek does have an AS-2T350 200VA PT instead of 100VA PT which I think might be better suited having more current capabilities, just my opinion not having any experience with Antek PT's, the price is certainly much cheaper than a Hammond PT.
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Re: advice on Clementine build

Postby fiftyfivefilms » Wed Dec 04, 2013 8:14 pm

Hi, The AS-2T350 200VA PT is not available....what do you think of just upgrading to a AS-2T300? the current capabilities are greater,200mA
gtasound wrote:Not having ever used an Antek PT I would say that 300-0-300v is alright having used the same in a Hammond PT and it is sounding fine, the main difference for me was the current capabilities of the Hammond are much higher to supply the power as well as the heater current to the power and driver tubes.
I am in the process of building another Clementine with another 650-0-650 Hammond PT.
Antek does have an AS-2T350 200VA PT instead of 100VA PT which I think might be better suited having more current capabilities, just my opinion not having any experience with Antek PT's, the price is certainly much cheaper than a Hammond PT.


...the easy solution would be an edcor but they are not taking orders until Jan 1st and then it's another 6 weeks! Oye!....

about your 650-0-650 build what kind of tubes can handle that?..

Cheers,

Kirk
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Re: advice on Clementine build

Postby gtasound » Wed Dec 04, 2013 11:50 pm

Hi Kirk,
The AS-2T300 should be fine you have 330ma of main current and have 2 x 6v 4A of current so you should be able to run tubes up from 6L6GB to KT150.
Made a mistake of specifying my Hammond PT which is not 650-0-650 but is 650VCT = 325-0-325 I can run all the tubes I mentioned above, have also run KT120 on the 300-0-330 smaller Hammond PT without issues and could also run KT150, both transformers have the current capabilities to run all those tubes not at their max power output mind you, but sounding very good without pushing them to hard which to me gives a more relaxed and dynamic sound, having very sensitive speakers I do not require a lot of power I have yet to go over 0.6 watt max. while pushing well over 100db.
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Re: advice on Clementine build

Postby fiftyfivefilms » Thu Dec 05, 2013 12:02 am

gtasound wrote:Hi Kirk,
The AS-2T300 should be fine you have 330ma of main current and have 2 x 6v 4A of current so you should be able to run tubes up from 6L6GB to KT150.
Made a mistake of specifying my Hammond PT which is not 650-0-650 but is 650VCT = 325-0-325 I can run all the tubes I mentioned above, have also run KT120 on the 300-0-330 smaller Hammond PT without issues and could also run KT150, both transformers have the current capabilities to run all those tubes not at their max power output mind you, but sounding very good without pushing them to hard which to me gives a more relaxed and dynamic sound, having very sensitive speakers I do not require a lot of power I have yet to go over 0.6 watt max. while pushing well over 100db.

Thanks for the quick reply!...I'm going to go with the AS-2T300,
....I thought you might have had a typo with your Hammond! good luck with your new project!
Cheers,

Kirk
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