JL Sargent Posted July 6, 2011 Share Posted July 6, 2011 I would like to try a tube preamp. Maybe there is a good kit out there that I'm not aware of? Quote Link to comment Share on other sites More sharing options...
jbsl Posted July 6, 2011 Share Posted July 6, 2011 here are two that might work for you. http://transcendentsound.com/Transcendent/Transcendent_Sound_Grounded_Grid_Preamp.html I did not build this preamp but did own one and liked it very much. http://www.decware.com/newsite/CSP2.html Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 I also found these guys. http://www.sonofield.com/KITS/kits-init.htm I was just thinking it might be a fun project to build a nice tube pre. But I don't know the good kits from the bad. Quote Link to comment Share on other sites More sharing options...
Guest davidness Posted July 7, 2011 Share Posted July 7, 2011 Tubes 4 HiFi has a number of tube preamp kits. This one looks cool, although I have no experience with any of their products. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 7, 2011 Share Posted July 7, 2011 I also found these guys. http://www.sonofield.com/KITS/kits-init.htm I was just thinking it might be a fun project to build a nice tube pre. But I don't know the good kits from the bad. JL before purchasing that 6H30 designed preamp I'd suggest you write them and ask how the single 6H30 in each channel is implemented in the design. The 6H30 is a dual triode (two tubes in one envelop). It's hard to tell from the pictures. If they do not want to tell you in detail then simply ask them if the preamp "inverts the signal" and I'll know from the response and the various specs they list what they did. If they come back with the right answers then I say it is the preamp to have out of the two listed in this thread. PS my opinion once I have the details will not change with the tubes4hifi suggestion thrown in the mix... The 6h30 or 6DJ8 from an electrical/Sonic standpoint is about the best readily available tube to use in a preamp when properly implememented. The 6DJ8 from a sonic standpoint is actually better but with it comes the insane problem with the market flooded with noisy used examples advertised as good that you have to weed through to get the sound it's capable of giving you. So the 6H30 is a much more headache free choice that will give you great performance. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 OK, I'll shoot them an email and ask about that! Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 I have not received a reply yet but I did find this schematic in their "library" Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 7, 2011 Share Posted July 7, 2011 They are using half the tube as a voltage amplifier and the other for a cathode follower output for low impedance output (drive very long cable runs and what not). It will be none inverting. It's not how I would prefer to run the tube but still respectable and the price is right. I say if you find no other 6H30 kit option why not give it a whirl. You could always change it later fairly easily in a point to point wiring arrangement. Of course do your home work and make sure the business is reputable. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 Thanks for the info Craig. I'm surprised you've thrown that BBX on the classifieds. What's that new project you have brewing? Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 7, 2011 Share Posted July 7, 2011 Thanks for the info Craig. I'm surprised you've thrown that BBX on the classifieds. What's that new project you have brewing? I'd tell ya but then I'd have to kill ya [] Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 7, 2011 Share Posted July 7, 2011 JL, If you go ahead with this 6H30 preamp feel free to send me the schematic with the values listed that should come with the kit. I'll cook up some upgrades before you even heat up the soldering iron. With a $500 price tag it surely has plenty of room for improvement. Much easier and cheaper to do it as your building it then after the fact. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 Thanks Craig, that would certainly make the project more fun! Unfortunately they have not replied to my email. Makes me wonder if they are still at it. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 7, 2011 Author Share Posted July 7, 2011 Tubes 4 HiFi has a number of tube preamp kits. This one looks cool, although I have no experience with any of their products. Yes, they have several options there don't they. That SP12 is nice looking. I have yet to figure out what that kit costs with a phono circuit though? Quote Link to comment Share on other sites More sharing options...
captmobley Posted July 8, 2011 Share Posted July 8, 2011 How's about the Bottlehead Foreplay? Not a 6H30, but certainly has a long track record and the company is solid. I have one matched with their Paramour 2A3 amps for my LaScalas and couldn't be more pleased. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 8, 2011 Author Share Posted July 8, 2011 Yes, that is a good looking kit! The extended version looks nice too. I'm gonna have to study up on that one. I take it you like yours? I just heard back from the 6H30 kit folks, they said: Hi,Thank you for your email.6H30 is recently developed double triod tube. The sound is very clear and so many persons like this sound.Do not worry about the signal amplification, the amplification is enough.Please refer the Circuit on Modules-Line Level Module(P6-30AS) in homepage.Thank you,Sonofield. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 8, 2011 Share Posted July 8, 2011 JL, It's really too bad they are not replying.... Here is a good read on the basic circuit topology they use in that 6H30 design http://www.tubecad.com/articles_2002/SRPP_Deconstructed/index.html Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 8, 2011 Author Share Posted July 8, 2011 I did hear back from the guy but I have concerns about that co. I have not found any reference to somebody building that kit on any forum. I would really like to try it but I don't want to flush 500 either. I'm gonna email them back and see if they will take Paypal. I took the address for the company and searched that on the internet and I got back this: Looks like a home address in Canada per the birds eye view on that map. I dunno. http://www.canada411.ca/res/9055028833/Hun-Jai-Bae/140561430.html Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 8, 2011 Author Share Posted July 8, 2011 When I asked about taking Paypal I got the message below. If I send this guy a check and I don't get a kit where am I at then? I'm gessing SOL! LOL. Hi,Sorry, we do not take Paypal, however, you can just send your personal check to us if you live in Canada or U.S.A..What is your power amplifier? 6H30 pre-amplifier is very well maching with tube and transistor amplifiers.If you want to order, please inform us your address and phone No. for shipping.Thank you so much,Sonofield Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted July 8, 2011 Author Share Posted July 8, 2011 JL, It's really too bad they are not replying.... Here is a good read on the basic circuit topology they use in that 6H30 design http://www.tubecad.com/articles_2002/SRPP_Deconstructed/index.html Yes that was a good read about it. This especially: In sum, the SRPP circuit has its uses, but those uses are limited. Where money and space allow, better more complicated circuits can be used to better effect than the SRPP; but where dirty and cheap are needed and where the load impedance is fixed and purely resistive, the SRPP is a good choice. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 8, 2011 Share Posted July 8, 2011 When I asked about taking Paypal I got the message below. If I send this guy a check and I don't get a kit where am I at then? I'm gessing SOL! LOL. Hi, Sorry, we do not take Paypal, however, you can just send your personal check to us if you live in Canada or U.S.A.. What is your power amplifier? 6H30 pre-amplifier is very well maching with tube and transistor amplifiers. If you want to order, please inform us your address and phone No. for shipping. Thank you so much, Sonofield Well here is what I would do...I seriously doubt this is a rip off but just to be safe. Use a Postal Money order...and send it via the post office with delivery confirmation. If they do not produce the goods they have commited Postal Fraud which is a federal offense and of course our relationship with Canada is very solid. From the chinglish writing I would venture to say this is a Chinese guy/gal leaving in Canada. Dishonesty is not a normal trait among the Chinese people especially the working class. They like to build things lets say affordable but I've never noticed out and out scams from my dealings with Chinese people. Quote Link to comment Share on other sites More sharing options...
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