Channel update: Spud amps, Pre-amps and 6P1
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- Опубликовано: 2 мар 2023
- I wanted to post an update video on the things I am working on. I love spud amps and have an idea in mind for an educational series based off the 6LU8 compactron tube.
Also we have a BUNCH of pre-amps to review and upgrade! I have a FX-10, a Nobsound E6 and a Leaf Audio PA-03 MKII. We are also going to revisit some past pre-amp shootout winners.
And lastly, I think I have a plan for the Nobsound 6P1, and no it doesn't involve a dumpster or a sledge hammer!
Here is my Patreon, as well as the donation page at my site, if you feel so inclined to help fund some of the future projects for the channel! You can also find my contact page at my website
www.patreon.com/user?u=87080658
www.skunkiedesigns.com/donate
Here is where you can buy T-shirts and other Merch with my fun logo.
skunkie-designs.myspreadshop.... 
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looking forward never a dull moment
Your Wednesday and didn’t know it. Kinda like I’mm a poet and didn’t know it. 😊
I would love to see a fresh build of a preamp that is point to point wired. Using 6SN7 or some 12A?7 tubes. But what would really be cool is if it had tone controls.
I agree Skunkie with the keeping it simple. Just like the A12 use a single 100mu triode to drive the finals. I think it's a slam dunk.
Skunkie great news on the el84's. They are a lovely sounding tube I think. And I agree why spend $$$ on new trans etc. It doesnt make sence for people with that amp Really looking forward to this build.Russian 6p14p are cheap and good.
I watch a lot of your videos! I appreciate what you share. I am also excited that you are not giving up on the Nobsound 6P1. I own one and it stopped working a while ago. I look forward to seeing how it turns out. Thank you!
With the prices of decent preamps I would love to see more builds on Tube preamps. 2 inputs 2 outputs. Rectifier like the old but plentiful 5y3 family, with 2 of the 12at7 or au7. Excited to see which project you choose next..Have a great day!!
Very interested in what you can do with the little China made pre-amps, and the point to point rewire :)
Love your channel,, Some day can you do a build of a nice sounding little tube buffer, I'm just getting into the tube thing, I'M currently using a Musical Paradise Mp301 integrated tube amp and love it. I would like to add a tube buffer to my solid state kit's and see what kind of sound I can achieve....THANK YOU MUCH. :)
Those are some "sleeper" tubes. They're great for a nice compact amp build.
Yes they are!
Hello, I've been watching your videos for a while now, and I don't really comment very much on YT videos, but I just saw this one and I need to chime in. That Leaf Audio preamplifier, I own that. I bought it just before all the Covid crap hit, and listen to it almost daily. I call it the "mystery amp" because there's virtually no info on it anywhere. None of the YT audio talking heads have ever mentioned it (that I know of). There was one review l found online, and I believe you mentioned him... he hated it. I bought the amp taking a big chance, based on nothing but a gut feeling. Terrible, I know, but you know what? It's been fantastic! I love it! Sounds beautiful paired with my Muzishare X7. I know nothing about amplifiers, tube or otherwise, so sometimes you go a bit over my head, but I've learned a thing or two from you. I can tell you l doubt you'll find the schematics on that preamp. I received it brand new, packed in a box, no manual, no paperwork of any kind, and yes, no warranty. Crazy. However, it's been awesome. I love the tone controlls (sorry audiophiles, not lol), and it really mate's well with that X7, which has also been wonderful. Like I said, I call it the mystery amp, like it was made in some Chinese underground factory or something lol. China hifi or Amazon doesn't even carry it. I bought mine off Alley Express of all places. Super interested in anything you do with this piece. Thanks!
Yeah, it does seem to be a mystery. It's VERY well made and I'm excited to dig into it soon!
Sounds like a great line up. Can't wait to watch all the videos
Popping some popcorn! Glad to hear that you will delve into some of the nuts and bolts of how to design a tube amp around the tube data.
That's the plan!
Well done Stephe
You have some great upcoming projects
Never heard of compactron - looking forward to this.
Hi Steph, enjoying all your series this should be a great project to learn some new things from you.
I’m fascinated to see how this one turns out. I love your choice of tube!
Thank you! Cheers!
Excited for this!
i really enjoy the videos thanks for what you share and talk about
Just finished building the 6BM8. It was a fun project and I learned a lot. It is running with my Klipsch Kg2 speakers, Ares2 DAC, and Kef KC62 subwoofer. The sound is great and way beyond my expectations. Looking forward to your series on Spud 2.0
Glad you built one and I agree, it sounds amazing for such a simply circuit! A powered sub lightly filling in the ultra low end really brings it to life.
Thanks for all your videos, learning a lot. Very interested in the pre-amps. I currently have the FX Audio Tube 03, similar to the one you mentioned and I have upgraded the opamp to muse02 and the tubes to Sylvanias and I'm amazed at the difference it made in my system for such a small price. I was wondering whether you have had a chance to look at the Zero Zone PRT 13A BAL as it looks like quitre a good circuit and build and includes balanced output. Looking forward to the next few videos looking at those pre-amps in more detail
At home in europe we call this tube a ECL82..............indeed a very nice sounding little tube , I use it also in poxwer supply and there were several vintage receivers / litttle amplifiers made with an PP ...........
Hi Stephe,
It’s Bob the owner of the Leaf Audio Preamp
The manufacturer is saying the circuit is off the Audio research LS22, and adopts a balanced dual mono design
Hope that helps some
All Chinese gear is a direct copy or based off someone else’s design have you ever seen an original Chinese audio product?
Have you looked at the Korg Nutube? It's a small, flat vacuum tube that runs on a voltage around 12V. It looks like it could be used in a nice, small preamplifier.
So much cool things planned. These all look like amazing videos, and I can't wait to see them. I see on the Nobsound P1 that it has the optional headphone output. In the redesign, are your plans to keep that functionality?
Yep!
If those Nobsound output transformers carry the part # 6632 [on a sticker on the bottom of the transformer], they are advertised as being 5K ohm primary, 8 ohm secondary [with a 4 ohm tap]. These transformers are used in a number of Nobsound products. Also, beware of the Nobsound power transformers. The part #7640 transformer[secondary 230V@150 ma, and 6.3V@3A, with a 110V/220V primary], caused a lot of 60Hz hum when mounted to the chassis, if you left it connected, but not mounted to a steel chassis, the hum disappeared. I determined that the transformer was saturating, due to poor transformer design, and the fact that the Nobsound circuit used a full wave bridge feeding a reservoir capacitor of 330uf. I fixed that by going to a Hammond 270DAZ xfmr and replacing the bridge with a full wave center tap rectifier. Nobsound is sending a replacement xfmr [what an ordeal that was], but I have no expectations that the replacement will be any different than the defective one. This was supposed to be the 6N2 & 6P1 SE amp kit, but after all of these changes [and looking at some of the poor quality parts], I changed it to a 12AX7 & EL84 amp with a simple circuit. The 5K output transformers do not sound bad, but they are definitely not Edcor/Hammond quality units. Hope that this helps.
That point to point 6SN7 Preamp build sounds like fun. When do you think you will get around to making it happen?
Hi Steph.. Cool stuff.. Have you tried E80CC’s with the 4S Preamp? It has around the same current draw for the heaters as a 12BH7.. That Nobsound DHT preamp looks promising as a buffer-gainstage for my old DAC that puts out
Hi, I'm looking forward to more preamp stuff. Im interested in putting a tube preamp before a class D amp. I have no idea what's involved or how these things match up. I see that VTV Amplifier is selling a "Custom Vacuum Tube Input Buffer" for the Purifi 1ET-400A class D amp modules. The input buffer also has removable op-amps. Any info you share on such things is greatly appreciated. Thanks!
I would say a zero gain "buffer" type "pre-amp" isn't likely to impact the sound much. If you are using an op-amp to get the gain, that's not gonna sound like tubes either!
@@SkunkieDesignsElectronics Ok, thanks. I'm subscribed and looking forward to more useful information. I do think that tube preamps prior to class d amplification will be popular in the future but needs to be done right.🙂
I had some questions that I emailed to Musical Power Supplies and he was prompt and courteous with his response. That being said, he is a small operation, and he may be having problems keeping up
Yeah, I wasn't bashing him. I'm not sure what happened but after several emails from different accounts, I gave up. I'm sure he is a nice guy and maybe just doesn't check his spam inbox?
@@SkunkieDesignsElectronics oh, please don't think that I thought you were bashing him. My only point of posting the comment is to encourage you and others to keep trying, if at first, they don't succeed in trying to get a hold of him, because I think he makes some nice stuff for not a lot of money.
Something you might consider covering is mods to the klipsch R51m speaker. Ive modded mine internally with better crossover, more bracing, wadding and deadening tiles and as good as the little speaker is, the mod make it a zillion times sweeter.
That sounds like a fun project. I need to work up some speaker measuring hardware so I can actually tell if it's better or worse.
@@SkunkieDesignsElectronics I think the thing that stuck me most is that they are now much less shouty when used as near field monitors.
Maybe use 6N1P's (Chinese 6N1's) as driver tubes instead?
hi skunkie i got a tube preamp shematic that i make from a engineer call Bruce Rosenblits and its a good preamp so i have 2 output impedance low and high ,the low impedance measure 800 ohm and i drive my nelson pass amp transistor measure 4.7 k impedance input so do you think my preamp output impedance is well matched with my amp .thanks and welcome for your return on you tube with new projects.
FX10, I had it!, it sounds bad!, internal switching power supply system, with booster, it creates a background hiss and has a high distortion, the output volume is not well controlled, and obviously to make it feel all in a small container the potentiometer is very bad!
It's actually a FX-01, not sure if that is a different model? It still could be bad :)
@@SkunkieDesignsElectronics yes, it looks the same to me!,but maybe it's different,mine has an internal booster