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https://www.decware.com/cgi-bin/yabb22/YaBB.pl AUDIO FORUMS >> D.I.Y. >> My SE84CDIY Clone https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1503937457 Message started by Alvaro Oliver on 08/28/17 at 17:24:17 |
Title: Re: My SE84CDIY Clone Post by Lon on 08/28/17 at 17:32:07 Very nicely done! Felicitaciones! |
Title: Re: My SE84CDIY Clone Post by Lonely Raven on 08/28/17 at 20:33:23 That's some really clean looking work! I love the labels and all! I'm Glad you're enjoying it! |
Title: Re: My SE84CDIY Clone Post by 4krow on 08/29/17 at 02:33:19 This is the level of product that I would like to produce someday. I have no apologies for what I turn out now, yet when I see this attention to detail, that becomes a reminder as to what a bit more time on a unit becomes. Point to point is the way to go, and the heavy duty yet appealing use of materials chosen, make me a believer. |
Title: Re: My SE84CDIY Clone Post by Alvaro Oliver on 08/30/17 at 18:44:33 Thank you all for your positive feedback, this encourages me to go ahead and think about future mods/projects. One more thing, I love how Zen sounds with the bias set at 2.7 KOhms. I don't understand why it was decided to remove this selector and leave only 0.96 KOhms fixed. |
Title: Re: My SE84CDIY Clone Post by Crazy Bill the Eel Killer on 09/02/17 at 02:56:59 Hello Alvaro, First, nice work. Now to your question,only guessing, of course, but here goes. I far prefer the hotter bias setting. The 2.7 k resistor sounds anemic and asleep to me. AAMOF, I prefer to run that tube hotter still ( mods required of course ) at around 5-6 ma on the 6922 types. utilizing a cathode resistor of 480 ohms. Way better to my ears. As I said I'm only guessing, but I would think Steve played around a lot and listened, and came up with the present operating points based upon his listening tests. I would also think ( again, only guessing ) that Steve got a lot of customer feedback favoring the hotter operating point. Clearly, based upon what you've done, you're capable to do the following. Throw a 480 ohm cathode resistor on the 6922, unbypassed, and modify your PS to get 95 volts or so on the plate of the 6922. Give a listen and see what you think. Cheers, Crazy Bill |
Title: Re: My SE84CDIY Clone Post by Alvaro Oliver on 09/04/17 at 19:16:41 Hello Crazy Bill, thank you very much for your answer. First of all, I hope my appreciation has not been taken as a negative review. I definitely agree with you, after a few days listening to more varied music I can conclude that my previous impressions were rushed. Effectively in the hottest mode you get a better sound with most styles, especially with rock. Now I prefer the quieter mode almost exclusively for jazz or more relaxed music. I will definitely try the modifications you advise me, just to see how it changes. Best regards, Álvaro |
Title: Re: My SE84CDIY Clone Post by clowkoy on 09/09/17 at 03:38:51 Nice build! Why didn't you use a tube rectifier? Your transformer has a 5-volt tap. You could swap rectifier tubes and change the operating points of the input and output tubes. The 10k resistors and 3.3uf caps are omitted in newer Zen from 84C+. The 1k power resistor needs to be at at least 12 watts. |
Title: Re: My SE84CDIY Clone Post by Alvaro Oliver on 10/18/18 at 22:28:00 Thanks clowkoy, I din't use the tube rectifier because I started from the ZKIT schemmatics, later I found out the SE84C schemmatic so I put the bias switch (and also the CCE mod) but it was too late for adding the tube rectifier. Anyway, I think I'm going to give it a try soon. How is that the new models doesn't have the 10k 3.3uF network? I've been looking for a newer schematic but I can't find any. Best regards, Alvaro |
Title: Re: My SE84CDIY Clone Post by benlefebvre on 01/11/19 at 13:52:58 Quote:
I was wondering the same thing. I was also wondering why the newer model according to that schematic use signal caps at 0.01uf values - I think the ZKIT plan includes them at 0.1uf. How does that change the sound, if at all? |
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