tube fanatic Posted February 28, 2012 Share Posted February 28, 2012 A friend sent me this link. Even if it doesn't sound that terrific, for the price it's an unbeatable way to gain some experience with building your own tube amp: http://www.siliconray.com/6n2-6p1-hifi-tube-amplifier.html Quote Link to comment Share on other sites More sharing options...
Brac Posted February 28, 2012 Share Posted February 28, 2012 and only, 2 months shipping! Quote Link to comment Share on other sites More sharing options...
Guest " " Posted February 28, 2012 Share Posted February 28, 2012 4WPC would be plenty for Heritage style speakers in a 16X14 room. Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted February 28, 2012 Author Share Posted February 28, 2012 and only, 2 months shipping! I don't know where they are located, but even if it's China, delivery can be fairly rapid. For the price though, even a 2 month wait would be worth it. A Hammond aluminum chassis for an amp like that runs around $25, and the transformers alone would push the cost well above what's being offered. Also, even if someone messes things up while building it, the financial loss isn't huge. Quote Link to comment Share on other sites More sharing options...
pzannucci Posted February 28, 2012 Share Posted February 28, 2012 Where is this shop located? Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 28, 2012 Share Posted February 28, 2012 China.... somewhere.... look at the schematics. Warning: clicking on "contact us" will get a risky connection warning...... Quote Link to comment Share on other sites More sharing options...
Marvel Posted February 28, 2012 Share Posted February 28, 2012 I kinda like the 'all tube design' with a bridge rectifier... [:^)] I downloaded one of their manuals, and it only went as far as mounting the main hardware (trannies, sockets, binding posts). Nothing on wiring the actual circuit. Bruce Quote Link to comment Share on other sites More sharing options...
djk Posted February 28, 2012 Share Posted February 28, 2012 " I kinda like the 'all tube design' with a bridge rectifier... " That's fine as long as you use fast rectifiers for low noise, and a plate-voltage delay to avoid stripping the emissive material from the tube plates during warm-up. Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted February 29, 2012 Author Share Posted February 29, 2012 " I kinda like the 'all tube design' with a bridge rectifier... " That's fine as long as you use fast rectifiers for low noise, and a plate-voltage delay to avoid stripping the emissive material from the tube plates during warm-up. The typical "receiving" tubes used in amps like this are not prone to cathode stripping from having plate (and screen with pentodes) voltage applied before the cathode is up to temperature. Even tubes like the 6V6, 6L6, and so on are not prone to this effect either. Amps which use rectifiers such as a 5U4, 5Y3, etc. (which ramp up the B+ well before the other tubes are at opeating temperature) do not demonstrate a higher rate of tube failure than amps which use a cathode type rectifier which heats at a rate similar to the other tubes in use. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted February 29, 2012 Share Posted February 29, 2012 the unit even has a center tapped heater supply. I like the vent holes around all the tubes. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted March 3, 2012 Share Posted March 3, 2012 For my first amplifier I built the predicessor to this amplifier: http://s5electronics.com/l8stereo.html This uses a circuit board that you populate. My first point to point wiring amplifier was this: http://diyaudioprojects.com/Tubes/50EH5/50EH5.htm I found doing the point to point project let me understand what was going on much better than the kit on a board. Quote Link to comment Share on other sites More sharing options...
jbsl Posted March 3, 2012 Share Posted March 3, 2012 You might try a Decware DIY tube amp. Here is a link to a Klipshc forum member building two of them. http://forums.klipsch.com/forums/t/120412.aspx?PageIndex=1 Quote Link to comment Share on other sites More sharing options...
NOSValves Posted March 3, 2012 Share Posted March 3, 2012 Funny the schematic doesn't show a bridge rectifier Quote Link to comment Share on other sites More sharing options...
Marvel Posted March 3, 2012 Share Posted March 3, 2012 I should have said solid state. Two diodes still make a full wave rectifier Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted March 4, 2012 Author Share Posted March 4, 2012 My first point to point wiring amplifier was this:http://diyaudioprojects.com/Tubes/50EH5/50EH5.htm I found doing the point to point project let me understand what was going on much better than the kit on a board. It's amazing just how nice a single tube "spud" amp can sound. I have a friend who built one a long time ago when he got bored one weekend (his usual designs are complex variants on the single ended theme.) Tubes like the 50EH5 or 60FX5 are great choices in that the voltage output of the typical CD player is sufficient to drive them to near full output. And with some negative feedback applied between the plate and grid, the frequency response can be tailored to suit one's listening taste. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted March 5, 2012 Share Posted March 5, 2012 I should have said solid state. Two diodes still make a full wave rectifier I was not commenting your post. The parts list they provide does not match the schematic. Quote Link to comment Share on other sites More sharing options...
erik2A3 Posted March 5, 2012 Share Posted March 5, 2012 What a cool looking little amp! Simple but still very presentable chassis, too. Thanks for providing the link, Maynard! Quote Link to comment Share on other sites More sharing options...
runninshine Posted March 5, 2012 Share Posted March 5, 2012 I just might order it, it could be fun for a first build. Would it move the woofer in a La Scala? Quote Link to comment Share on other sites More sharing options...
erik2A3 Posted March 5, 2012 Share Posted March 5, 2012 If one were so inclined, there is a place on the chassis behind the power transformer that could be punched for a valve rectifier, such as possibly a 5Y3. A filament transformer would likely be needed too, but could probably be installed on the inside side of the chassis. Very neat little amp just on its own. Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted March 5, 2012 Author Share Posted March 5, 2012 I just might order it, it could be fun for a first build. Would it move the woofer in a La Scala? Hey Sterling! You will be amazed at how loudly the LSs can play with such little power. For a first project, this looks like a good bet imo. Best regards-- Maynard Quote Link to comment Share on other sites More sharing options...
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