bpribadi 0 Report post Posted August 18, 2004 Great stuff Digi!!! Thanks! Don't mind show to us the mini tube board, schematic, and price please I think there are few of us that 'going tube' like what huangyong said Share this post Link to post Share on other sites
digi01 0 Report post Posted August 18, 2004 I am glad show this project. this is my mj mini tubes headamp board.the kit is available. Share this post Link to post Share on other sites
bpribadi 0 Report post Posted August 18, 2004 Please share how it sounds Is the kit availabe for ordering ? Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 18, 2004 bpribadi, I do not know how it sounds, you have to ask digi01 to write a review then. There's a good news to those who are "going tube", DIY tube amp is no longer difficult, costly and messy. Since the thread of this group buy is about SMD-DIP socket, I will open a new thread for group buy for MJ. FYI: digi01 arranges a set of kit which will benefit all of us, in term of price and difficulty level. Some of the parts are cheaper in China while tubes and transformer is cheaper (shipping of heavy tranny is $$$$) locally. So, he will only supply the neccesary parts and we can buy the tubes and tranformer in Singapore. Share this post Link to post Share on other sites
bpribadi 0 Report post Posted August 18, 2004 Good idea huangyong! I'm not really tube fan, because of that, I would like to hear 'experienced' headphone listener to give some comment of how it sounds, probably compare to something else like PIMETA, PPA, or others, before I decide to try it Anyway it is good to see how many of us interested with tube amp, by starting another group buy for the MJ tube Cheers! Bram Share this post Link to post Share on other sites
mukegile 0 Report post Posted August 18, 2004 Thanks all....,wow ..surprise here ...1 day without the forums... alot had been done here.... yes..definetely this is the thing that i've been waiting for.... Digi and HuangYong.... how much will it cost to get the kit ?... Share this post Link to post Share on other sites
mukegile 0 Report post Posted August 18, 2004 well u got me excited here... , i would agreed that trannies and tubes doesnt need to be included., it'll kill us on the shipping cost... anyway.. Digi. how do u wire up the filaments ? (paralled to all the tubes or different output from the trannies ? ? Share this post Link to post Share on other sites
bpribadi 0 Report post Posted August 19, 2004 Thanks Naz to move this thread! During discussion sometime out of track Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 19, 2004 SHOW time.... Now talk bout the amp first. The Mini Tube Amp is based on Morgan Jones design and modified by digi01. The amp can function as a dedicated pre-amp and headphone-amp. The PSU uses tube rectifier. That's all i know Now, the kit.... The kit will include 2 PCB (Amp + PSU), Capacitors, Resistors, Diodes, tube sockets, 2 ALPS potentiometer (not ALPS BLUE), 4 RCA jacks, headphone jack, screws, casing and etc. Tubes and transformers are OUT!!!! The amp needs 3 e88cc or 6922 or equivalent and 1 6N4 rectifier tube or equivalent. We can get the 2 needed transformers from farnell. 1.Part no. 149990 30VA 2x18V (S$43.10 each) or use 30VA 2x9V 2.Part no. 159414 12VA 2x12V (S$12.00 each) ------------------------------------------------------------------------------------------- The amp. -------------------------------------------------------------------------------------------- The PSU. -------------------------------------------------------------------------------------------- The 2 ALPS potentiometer --------------------------------------------------------------------------------------------- Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 19, 2004 This is the transformers connection. Share this post Link to post Share on other sites
bpribadi 0 Report post Posted August 19, 2004 The black resistors, are they the Welwyn 0.5%? Huangyong, have you got the kit and tried it? Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 19, 2004 I am going to get it soon, may be buy it together with the group buy.Share shipping is always cheaper. Share this post Link to post Share on other sites
digi01 0 Report post Posted August 19, 2004 The black resistors, are they the Welwyn 0.5%? Huangyong, have you got the kit and tried it? NO,it is DALE 1K 5W 1% resistors. here are part list (standard KIT) main PCB: ELNA standard 220uf/400v* 2 (for out put) ERO 0.47uf/630v resistors: 147/3W*2 ,CGW 31.6K/3W*2 , CGW 100,*2 ,1/2W DALE 182*2 ,1/2W DALE 267*2 ,1/2W DALE 750*2 ,1/2W DALE 10K*2 ,1/2W DALE 20K* 2 ,1/2W DALE 1M* 4,1/2W DALE tube 9pins socket*3 interface socket 4pins*2,2pins*2 RCA golden*4 POT,alps18*2 (or alps27 blue*1) POWER SUPPLY BOARD: 47uf/450v elna standard caps*3 3W 1k*3 DALE diode 1n4007 *4 SOCKET 4Pins*2,2pins*1 hook wires,some... Share this post Link to post Share on other sites
mukegile 0 Report post Posted August 19, 2004 (edited) HuangYong...are u sure thats the right P/S diagram ? I dont see any logic to get 0-18V to get unto input of the second trannies (if u really wire it up correctly...on the second trannies...It will requires 24 V there) Actually what we can do is to get a trannies that have multiples secondary.... ( i can get it custom wind locally....) by the way.....it's abit weird to get the filament wire up in series... (i dun get it) Edited August 19, 2004 by mukegile Share this post Link to post Share on other sites
huangyong 0 Report post Posted August 19, 2004 All the pics are provided by digi01. Let him to explain this. Share this post Link to post Share on other sites
