Post by Kaloyanr on 11/01/11 at 03:11:44
Yes, new colour wires:
The output transformer, why it has a white / blue screen, which is not used?
Did I put them right on the scheme?
|
Forums
https://www.decware.com/cgi-bin/yabb22/YaBB.pl SUPPORT FORUMS FOR ZKITS >> ZKIT 1 Support forum >> new edcor transformer help https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1319671196 Message started by coopercustoms on 10/27/11 at 00:19:56 |
|
Title: new edcor transformer help Post by coopercustoms on 10/27/11 at 00:19:56 I'm new to this and just need someone to hold my hand. The new edcor transformers have different color wires than are silkscreened on the board. The updated schematic helps a little but I would really like a clear translation between the new wire colors and what is on the circut board. Thanks for any help. |
|
Title: Re: new edcor transformer help Post by Kaloyanr on 10/27/11 at 01:48:39 me too I need some info for this. |
|
Title: Re: new edcor transformer help Post by dank on 10/27/11 at 17:32:07 You need to identify the two primary wires (they go to B+ and the tube plate) and the secondary wires (they go to the speaker). With a DVM (digital volt/ohm meter - digital multimeter) measure the 4 wires. The two that read just a couple of ohms are the secondary, and the two that read a few hundred ohms are the primary. If you don't have a DVM, buy one...you have no business building a Zkit1 without one. The cheapest DVM you can find, even the $2 one, when on sale at Harbor Freight, will be plenty good enough. As far as phase and +/- go, usually the + is a color and the - is black or white. Red is almost always +, black is almost always -. For sure, hook up both transformers the same way and you can't go too far wrong. Dan |
|
Title: Re: new edcor transformer help Post by coopercustoms on 10/27/11 at 18:18:53 thanks. i do have a meter and i do know the values of the leads coming from the transformers. output transformers make sense with the exception of the screen wire. does this go to the board? it's the power transformer I need the most help with. primary is easy. secondary is a little confusing. |
|
Title: Re: new edcor transformer help Post by dank on 10/28/11 at 14:38:42 Output transformer screen wire (if it has one) will not be used. Power transformer 240 v: primary (black/black) goes to switched, fused 220-240 vac. yellow & yellow 5vac secondary is not used, just as the yel & yel with yel/wht on the schematic is not used. Brown & brown 6.3 vac secondary goes to the tube heaters - there is no center tap wire on this coil, so there will be no wire to solder to the gnd spot on the Zkit1 circuit board. Red & red with black/red centertap is the high voltage secondary that should correspond to the same colored wires on the schematic. Power transformer 120 v: identical to 240 vac except there is no (unused) 5vac secondary winding and it connects to switched, fused, 120vac. Dan |
|
Title: Re: new edcor transformer help Post by coopercustoms on 10/28/11 at 16:11:59 thanks, that makes sense. |
|
Title: Re: new edcor transformer help Post by Kaloyanr on 11/01/11 at 03:11:44 Yes, new colour wires: The output transformer, why it has a white / blue screen, which is not used? Did I put them right on the scheme? |
|
Title: Re: new edcor transformer help Post by Kaloyanr on 12/03/11 at 16:00:51 Something important! The new transformer missing GND wire from heating (two new brown wire) In the old they were greens and there had one to GND (grn/yel), now missing! I had an unpleasant noise, I just put an extra wire from one brown end to GND and the noise disappeared almost. I do not know how to properly Steve has to say. May be have to use 2 resistors 100 Ohm from each end, or ?!  Regards Kaloyan |
|
Title: Re: new edcor transformer help Post by mboxler on 05/31/12 at 16:03:52 Kaloyanr... First post, as I just purchased the ZKIT1 (board only). Have you completed your build, and if so, can you provide pictures of the transformer connections to the board? Edcor wire colors concern me, and I'd feel more comfortable with a picture before I begin. Thanks, Mike |
|
Title: Re: new edcor transformer help Post by patrick on 08/20/12 at 00:22:54 Hi, I am totally stumped. Can some one please tell me where the brown wires from the Edcor XPWR107-120 are supposed to connect to the SE84C board? |
|
Title: Re: new edcor transformer help Post by mboxler on 08/20/12 at 14:29:28 Hi patrick I assume you have the REV 9 2011 PCB. The brown wires are used to heat the tubes. Solder them to the holes marked GRN (you will notice they run to pins 4 and 5 on all three tubes). Steve has recently modified the board to match the colors of the EDCOR transformers. His revision also talks about creating an artificial center tap for the brown wires. I haven't tried it yet, but it required two 100 ohm resistors running from each GRN hole to ground (I plan on using the GRN/YL, which would have been the connection if the brown wires were center tapped). This mod is supposed to reduce the hum you will hear from the tubes when you light them up. Hope this helps. Mike |
|
Title: Re: new edcor transformer help Post by patrick on 08/22/12 at 02:42:40 Thanks! I actually figured it out after writing this post. I just looking at the schematic and after adout two hours the light went off! |
|
Title: Re: new edcor transformer help Post by patrick on 08/27/12 at 00:58:27 Hi What does it mean when the speaker binding post register 450+ vdc when the amp is powered up? I don't think this is nornal. |
|
Title: Re: new edcor transformer help Post by mboxler on 08/27/12 at 02:56:08 Hi Patrick... I'm no expert (someone please correct me if I'm wrong). Speakers require alternating current. A tube is a high-voltage/low-current (high-impedance) device, while a speaker is a low-voltage/high-current (low-impedance) device. The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. This is necessary to get an efficient transfer of the audio signal to the speaker. (I copied this from an article, so I hope it's true). I think you are getting a false number when you are using the DC voltage setting on your meter. What were your other test point voltages (they are DC)? If they are okay, then you should be good to go. Mike |
|
Title: Re: new edcor transformer help Post by patrick on 08/27/12 at 03:20:05 Hi Mike, Point A is abot 450, point B 309, point C and D are both OK though. To test the speaker terminals, I kept the voltmeter settings the same after testing A, and the measurements were the same as with A. I have the board in a wood enclousure atop atravertine tile. I have the amp grounded with a grounded cord using the sheild ground from the board. I know I have done something wrong - just not sure where. The tubes light up and there isn't any smoke, just very high voltage! |
|
Title: Re: new edcor transformer help Post by mboxler on 08/27/12 at 18:08:03 Odd... 1) VPA should be around 346 VDC. Are you sure you are measuring either the output from the 1K 5W resistor or the input to the 6.8K 2W resistor? 450 VDC sounds more the output from the diodes or the input to the 1K resistor. 2) I'm showing 0 VAC and 0 VDC on the speaker outputs (with no input, volume turned all the way down. Can you describe how you wired your output transformers? Sorry I'm not helping much! Mike |
|
Title: Re: new edcor transformer help Post by patrick on 08/29/12 at 20:05:15 Hi Mike, Your help was invaluable, thanks! After reading your post, I rewired the two amps and like magic the darn thing worked! It sounds great paired with my vintage Infinity RS6001s. Now to convince my wife that I need more effecient speakers! Wish me luck. |
|
Title: Re: new edcor transformer help Post by patrick on 08/29/12 at 20:14:55 Here is attempt at originality |
|
Title: Re: new edcor transformer help Post by mboxler on 08/29/12 at 20:58:10 Congratulations! I'm not sure how I helped, but.... I keep trying to work on mine, but life keeps getting into the way! I'll be driving a pair of Klipschorn's (at 104 dB sensitivity, should be plenty of power). I also have a pair of Klipsch RF-83's. Should be fun. If you like DIY, there are some neat single driver kits that would be fun to build! Great imaging! Great Christmas gift from your wife! Best, Mike |
|
Forums » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |