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Old 6th January 2010, 08:16 PM   #1
trigger is offline trigger  United States
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Default ebay, 7c kit, worth it?

PCB ref Marantz 7C 7-C Tube Pre Amplifier Amp (Stereo) - eBay (item 320449773277 end time Jan-15-10 02:35:14 PST)

VACUUM TUBE LINE PREAMP MODULE - 7C BASED DESIGN - eBay (item 260534041961 end time Jan-13-10 11:08:57 PST)


just wondering if anyone experienced one of these kits? if not perhaps some speculation?
...and witch kit seems better, and witch is cheaper in the end? i have little to no budget here, probably selling old projects to fund new ones....
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Old 6th January 2010, 08:45 PM   #2
Arnulf is offline Arnulf  Europe
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Are you sure these are kits ? First one clearly states it's just the PCB + assembly manual (a sheet of paper, I presume). The other one appears more vague (the ungodly ugly combination of colors and huge amount of text is why I couldn't bring myself to stomach that entire description) and I'm not sure what is actually included.

Assuming those were kits they'd still require PSU material and tubes at the very least. If money is tight at the moment, tube preamp probably shouldn't be at the top of your priority list anyway. Sleep it through, those Chinese aren't going to run out of PCBs anytime soon
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Old 7th January 2010, 12:10 AM   #3
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As for your first link, the kit with parts and tubes, minus case, from the same dealer, costs $238.00:
DIY Kit ref Marantz 7C Tube Pre Amp (Stereo) Standard - eBay (item 320453819271 end time Jan-24-10 03:39:18 PST)
And the full kit from the same dealer costs $399.99:
Full Kit ref Marantz 7C Tube Pre Amplifier (Stereo) - eBay (item 320453820561 end time Jan-24-10 03:43:31 PST)
Plus $89 shipping for the full kit.
You can get similar kits for much better prices.

As for your second link, it says nowhere what the "kit" actually contains.

An example for better offer would be, for instance, this:
LS-22 pre-amplifier, assembled & tested (minus tubes) for $73.70:
DIYCLUB
Plus 3 12AX7 for $36.18:
DIYCLUB
Plus LS57 tubes HT rectifier and regulator, assembled and tested, including tubes, for $104.52:
DIYCLUB
Plus 100W R-Core Transformer for $34.84:
DIYCLUB
Which makes the total kit, minus box, $214.40 and you can add there a case for $41.54, for a total of $255.94 plus shipping, which is calculated by weigh and for the full kit, including transformer and case can be around $100.
Still a better offer than your first link, however a total of about $356, including shipping, is something to consider. Yet, it's better than the total of about $489 for a full kit, including shipping, for a full kit from your first link.

Even all the above offers are very expansive compared to the following SET integrated tube amplifier, shipped from Canada, which I heard high praises of its' sound quality:
MP-401 EL156 Integrated Amplifier [MP-401] - $599.99 : Musical Paradise - Audio Art
For about $600 plus shipping from Canada.
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Old 7th January 2010, 02:56 AM   #4
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If you really need a pre-amp, which is doubtful, what does it need to do? Step up voltage? Drive long cables? Select between sources? Just a volume control? Phono input?

I don't know if the Marantz 7c was a classic, but it sure is old. Tube tech has improved markedly since that time, despite the solid state revolution. Just as a 68 Barracuda was a hot car, these days we also like to stop, turn corners and not die in minor accidents.

Go to bottlehead.com, and look at the foreplay kit. Good stuff, and lots of good support. Or search here for aikido, which you can buy as a PCB. Good support on that too.

Don't be another ebay junk victim. Too many posts here about how somebody bought this "kit" on ebay and it caught fire, etc.

Or just go to Radio Shack and buy a 100K stereo audio pot and put it in a box. Much better than you might expect, and dirt cheap. Much, much better, actually.
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Old 7th January 2010, 03:50 AM   #5
pjanda1 is offline pjanda1  United States
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You might run a search over at Audio Asylum. I think Michael Samra has played with their "kits" and said good things. I'm not sure it would be a good beginner project. There are, of course, many more proven options, like Bottlehead or the Aikido. I'm watching Jim McShane's page with a great deal of interest.

Paul
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Old 7th January 2010, 03:58 AM   #6
mavric is offline mavric  United States
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NOOOOO EEEEBAYYYY , please do as suggested, sleap on it, do some more research as money seems to be an issue. if not, go ahead, you will be the next person trying to get your money back, ebay is not worth looking at, a waste of time. sorry if I insulted you, but it is the truth, "you get what you pay for" advice is free, and I would listen to these guys, they know what they are talkng about as I myself am still learnig.
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Old 7th January 2010, 04:44 AM   #7
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by mavric View Post
NOOOOO EEEEBAYYYY , please do as suggested, sleap on it, do some more research as money seems to be an issue. if not, go ahead, you will be the next person trying to get your money back, ebay is not worth looking at, a waste of time. sorry if I insulted you, but it is the truth, "you get what you pay for" advice is free, and I would listen to these guys, they know what they are talkng about as I myself am still learnig.
Gota love hongkong for doing this, finding a design and selling it for HUGE amounts of $$$, it's quite sad. Might get into trouble for this comment, but well it's how i strongly feel, everything on ebay for parts and kits from hongkong is pass produced CRAP! 100% JUNK just fake crap.
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Old 7th January 2010, 06:29 AM   #8
wwenze is offline wwenze  Singapore
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Hong Kong...

Import from China, put English brand name, sell for 100-200% profit.
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Old 7th January 2010, 07:08 AM   #9
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hmm.....linestage using 12AX7, lots of caps, resistors and feedback... why would a linestage require that amount of gain? its a collector's classic alright, the original equipment that is.
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Old 7th January 2010, 09:57 AM   #10
trigger is offline trigger  United States
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thank you all much for the constructive criticism, its what i was looking for.
as for my project, i have no idea, i am just tinkering around with some old projects and looking for some thing to keep me busy over the winter, the ice fishing is poor.
my goal here is to get a tube amp to power a cassette player also fm radio and my pc sound card. the cassette player needs the pre amp, i am working with a few old el84 amps. i have access to many salvage parts, tiring to keep cost under 50, witch is why a PCB board is ideal, the rh84 was suggested to me in a separate post, i am considering it for all i need is a choke for 20$ but for now i am just researching and studying for this project
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