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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 12th January 2018, 03:25 AM   #21
DaMuffinMan is offline DaMuffinMan  United States
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Ok i'll check Digikey, I checked digikey and it looks like you have to buy 1000 any suggestions? Through Hole Resistors | DigiKey

Last edited by DaMuffinMan; 12th January 2018 at 03:48 AM. Reason: error
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Old 13th January 2018, 09:26 PM   #22
DaMuffinMan is offline DaMuffinMan  United States
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In ordering the Edcor CXSE 5. should I order the 8 0hm secondary? I have very efficient Klipsch Cornwall speakers. 100db sensitivity.
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Old 14th January 2018, 12:06 PM   #23
colnago55 is offline colnago55  United States
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Most speakers are 8 ohm, but some are not. It looks like the currently made Cornwalls are 8 ohms.

Did you find the 10k, 3 Watt resistors you needed?
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Old 14th January 2018, 05:30 PM   #24
DaMuffinMan is offline DaMuffinMan  United States
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Colago55 these are Cornwall 1 from 1983 and no I did not find that part. And I also need some direction on which choke to order THANKS
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Old 15th January 2018, 02:06 PM   #25
mkane77g is offline mkane77g  United States
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Bout Time SSE Build now Starting need help
I've got some 10k 6.5 w resistors you can have
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Old 15th January 2018, 02:14 PM   #26
colnago55 is offline colnago55  United States
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Here's a link to resistors you can use.
FMP300JT-73-10K Yageo | Resistors | DigiKey

There are many other options. digikey has a spot on the search page where you put in the quantity you want, that filters out the minimum quantity needed.

For a choke, I like the Triad C-14X, which I hide under the chassis. It's cheap and it works.
Here's a link
https://www.digikey.com/short/q8h092

You should find out if your speakers are 4 or 8 ohm.
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Old 22nd January 2018, 10:02 PM   #27
DaMuffinMan is offline DaMuffinMan  United States
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So I only need to purchase a few more items. Can you please chime in on which one would be the best for my build and why?

Choke: Triad C-14X or Hammond 159R? George posted this in here in regards to chokes "Just about any choke that can handle 150 mA or more will work. Aim for 5 to 10 Hy and a DC resistance between 100 and 250 ohms. I"

Also for a Tube Rectifier: GZ-34 or 5AR4 tube

And I have chosen 6V6GT EH as the get it started and going before you blow up the expensive KT88 tubes.

And what is a good " Auxiliary power supply cap"?


I am using Edcor CXSE25-5K @ 8 ohm OPT and an Allied 6K7VG Power transformer, And the tubes are EH KT88 (I will roll some others also) I am not using the FREDS, and am using a JJ Electronics T-12AT7 Vacuum Tube ECC81 for pre-amp. TEMCo Motor Run Capacitor, I would also like to run a feedback switch, Mode Switch once I get it running.

I will be using this to power my Klipsch Cornwall 100db speakers.

Thanks
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Old 22nd January 2018, 11:03 PM   #28
mchrismag is offline mchrismag  United States
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Looks like the chokes are very similar and both would work. I have the triad choke and it works well. GZ-34 and 5ar4 are the same tube as far as I know. I have a cheap Chinese 5ar4 that I got for about $10 and it's worked fine for 2 plus years. I have the same Allied power transformer and it will put out way too much voltage for those 6v6gts. I would suggest instead some jj el34s for the "get it started and going before you blow up the expensive kt88s". That's what I did and they can stand 480 volts plus with 680 ohm cathode resistors and 470ish with 560 ohm. That's what I started with along with a jj 12at7. I now have some "expensive" kt88s in it along with a rca black plate 12at7. I think the jj el34s were about $12 each when I got them.

Matt
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Old 23rd January 2018, 06:20 PM   #29
DaMuffinMan is offline DaMuffinMan  United States
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Thanks mchrismag, can you explain a little bit more what you mean by "they can stand 480 volts plus with 680 ohm cathode resistors and 470ish with 560 ohm." Is that a resistor or something I would need to swap out before I installed the jj el34s. And then would I have to swap it out again to put in the KT88's?

Thanks Im a noooooob!
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Old 23rd January 2018, 09:43 PM   #30
PDL is offline PDL  United States
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The cathode resistor sets the bias point of the tube. Tube dissipation is based completely on the bias point. George explains this on the tubelab site. There is a chart showing various levels of distortion, harmonics, damping factor and other things based on the bias point posted on the site. You need to understand this chart before you proceed.

Sovtek rectifiers are almost as cheap as the Chinese ones and are more reliable in my experience.
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