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11-07-2008, 08:27 PM
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Headphoneus Supremus
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Join Date: Aug 2007
Location: Rocky Mountains, CO
Posts: 11,823
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Quote:
Originally Posted by kuroguy
Id guess he'd get about 8000 hours out of a set. that works out to 4 years per set at 6 hours use a day.
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Okay, thanks. We have 4 sets of tubes, and I wasn't sure we needed more. At 2 hours a day (or 4 hours every other day) that would last 48 years!
__________________
Quote:
Originally Posted by Leonardo_BVB
...honestly, it's like comparing ugly Betty with Scarlett Johjansson, you do not know where to start because you cannot take your eyes off Scarlett...
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Larry Head-Fi Feedback
Oct 09 Colorado CanJam @ RMAF Impressions
SEE PUBLIC PROFILE "ABOUT ME" FOR LINKS TO REVIEWS AND MY GEAR.
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11-08-2008, 05:22 PM
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100+ Head-Fi'er
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Join Date: May 2008
Location: Oxford, UK
Posts: 224
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11-08-2008, 11:53 PM
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1000+ Head-Fi'er
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Join Date: Dec 2006
Location: Flagstaff, AZ
Posts: 1,118
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Quote:
Originally Posted by gurusan
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Looks nice, what case is that?
I'm starting to gather parts to build one of these. I probably shouldn't since I have several other projects with part sitting here :P
I have a question about the power supply. I have one of these I got for free. I think it will work, but wanted to get a second (and maybe third, fourth etc) opinion.
http://www.power-guide.com/pdf/SPU50.pdf
I have the SPU50-9
__________________
Work: FLACs->Foobar->BantamDAC->MHSS->HD580
Home: FLACs->Foobar->BantamDAC->SOHA II->HD650
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11-09-2008, 12:05 AM
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1000+ Head-Fi'er
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Join Date: Dec 2007
Location: Honolulu,HI Chicago,IL
Posts: 1,020
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Quote:
Originally Posted by Hayduke
Looks nice, what case is that?
I'm starting to gather parts to build one of these. I probably shouldn't since I have several other projects with part sitting here :P
I have a question about the power supply. I have one of these I got for free. I think it will work, but wanted to get a second (and maybe third, fourth etc) opinion.
http://www.power-guide.com/pdf/SPU50.pdf
I have the SPU50-9 |
The 48VDC is specified at 240VAC input.
It wouldn't work for a linear psu for sure, but switching psu's work differently.
I'm not sure myself actually.. =/
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11-09-2008, 12:24 AM
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1000+ Head-Fi'er
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Join Date: Oct 2006
Location: Vancouver, BC
Posts: 1,239
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Should be fine, though the noise spec is quite poor. You may want to add some additional filtering.
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11-10-2008, 01:46 PM
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Junior Head-Fi'er
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Join Date: Nov 2008
Posts: 1
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Thanks to all
I just completed a build of the Starving Student. It works beautifully and the sound is excellent. I just wanted to thank pmillet for posting the original design, and all the thread contributors here for sharing their experiences. In the name of sharing information, here are my substitutions for the currently unavailable parts -
Mouser parts -
540-RRA22H3BBRLN - Rocker Switches SPST ON-OFF 10A RED
598-150104K100AA1 - DC Film Capacitors .1UF 100V 10%
647-TVX1J151MCD - Axial Aluminum Electrolytic Capacitors 150uF 63V 85c 10x21 20%
Digi-Key
8568K - Control Knob
I purchased the 19J6 Tubes and sockets from Radio Electric Supply, Vacuum Tubes Radio Tubes - 5,000 different tubes in stock - Over 10 million tubes!. ESRC1 Corp also said they had tubes and sockets in stock. They're at Vacuum Tubes @ ESRCVacuumTubes.com - Contact Us Page.
I used a Radio Shack project box, with the Aluminum lid used as the mounting point for all components. To drill the holes, I used a step bit bought via Amazon (it was chosen based on cost, needed 1/4" shank, would drill through soft metal). It's at -
Neiko Titanium Step Drill Bit; 1/4" Hex Q/C Shank; 12 Steps; 3/16" - 7/8" at
Amazon.com: Neiko Titanium Step Drill Bit; 1/4" Hex Q/C Shank; 12 Steps; 3/16" - 7/8": Industrial & Scientific
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11-10-2008, 05:51 PM
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Headphoneus Supremus
Moderator
Resistorous Conflagorous
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Join Date: Nov 2004
Location: Seacoast, NH
Posts: 7,313
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Guys/Gals,
I'm going to be listing 9 pairs of RCA 19J6s some time this afternoon (right after I find time to breath  ). The cost to acquire these tubes was quite a bit higher than when Pete first launched this product but I don't think it'll put the amp out of the starving student category just yet. Most of the pairs that I'm listing are new old stock RCAs that were taken from a TV service repair man's kit. It took my tube dealer doing quite a bit of leg work to find them and they've all been tested so you should be getting great tubes. Look for the add in the FS forums within the next few hours. Unfortunately this is going to first come first serve type deal.
Happy building.
Nate
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SB3/Arcam CD73 -> Hertsens Signature DAC -> Project Menace -> Woody HF-1 or HF-2
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11-10-2008, 06:06 PM
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Headphoneus Supremus
Moderator
Resistorous Conflagorous
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Join Date: Nov 2004
Location: Seacoast, NH
Posts: 7,313
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__________________
SB3/Arcam CD73 -> Hertsens Signature DAC -> Project Menace -> Woody HF-1 or HF-2
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11-10-2008, 06:15 PM
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100+ Head-Fi'er
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Join Date: Sep 2008
Posts: 209
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Holy crap, $20.70 for a pair of tubes. I've got 4 tubes and a complete amp that I might consider selling (But it sounds really sweet).
I'm not one for building amps with pricey tubes, but this one might still be worth building. Even at those prices.
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11-10-2008, 06:37 PM
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Headphoneus Supremus
Moderator
Resistorous Conflagorous
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Join Date: Nov 2004
Location: Seacoast, NH
Posts: 7,313
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Quote:
Originally Posted by kuroguy
Holy crap, $20.70 for a pair of tubes. I've got 4 tubes and a complete amp that I might consider selling (But it sounds really sweet).
I'm not one for building amps with pricey tubes, but this one might still be worth building. Even at those prices.
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The tubes cost me $7 each. So that's $14 + $5 shipping + PP. As it is I'm sure I'll lose money since I'll have to buy little boxes and packing material for these. So what do you want me to do, give them away and donate the $140 I had to pay to get them to me to the "cause". Some days I wonder if it's worth trying to help. 
__________________
SB3/Arcam CD73 -> Hertsens Signature DAC -> Project Menace -> Woody HF-1 or HF-2
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11-10-2008, 07:08 PM
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100+ Head-Fi'er
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Join Date: Sep 2008
Posts: 209
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No, no. I wasn't commenting on what you are doing. The price certainly looks fair, and I applaud you for helping out in this manner. It is way above and beyond the call of duty. My comment was about how supplies of this tube (which has been around for years) seem to have dried up in a matter of weeks.
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11-10-2008, 07:14 PM
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Junior Head-Fi'er
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Join Date: Nov 2008
Posts: 14
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Quote:
Originally Posted by n_maher
The tubes cost me $7 each. So that's $14 + $5 shipping + PP. As it is I'm sure I'll lose money since I'll have to buy little boxes and packing material for these. So what do you want me to do, give them away and donate the $140 I had to pay to get them to me to the "cause". Some days I wonder if it's worth trying to help. |
Strange, I found these tubes with little problem. I ordered mine from this place:
Vacuum Tubes, Inc. New Tubes, 8JU8A to 50FK5
I believe I paid 3 bucks each, plus a pair of sockets and shipping came out to about 12 dollars shipped.
I plan to put mine together later this week. I am using a nice looking cigar box as the case. I hope it works out okay! 
Last edited by Malanga; 11-10-2008 at 07:17 PM.
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11-10-2008, 07:16 PM
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Junior Head-Fi'er
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Join Date: Nov 2008
Posts: 14
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Quote:
Originally Posted by n_maher
The tubes cost me $7 each. So that's $14 + $5 shipping + PP. As it is I'm sure I'll lose money since I'll have to buy little boxes and packing material for these. So what do you want me to do, give them away and donate the $140 I had to pay to get them to me to the "cause". Some days I wonder if it's worth trying to help. |
I believe your efforts are appreciated. Thanks for helping to forward our hobby! 
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11-10-2008, 09:48 PM
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Headphoneus Supremus
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Join Date: Aug 2007
Location: Rocky Mountains, CO
Posts: 11,823
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Quote:
Originally Posted by n_maher
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Great! While I'd like more, I am going to sit back and let the people who have NO tubes buy some, so we aren't hoarding tubes and people can't build new amps.
__________________
Quote:
Originally Posted by Leonardo_BVB
...honestly, it's like comparing ugly Betty with Scarlett Johjansson, you do not know where to start because you cannot take your eyes off Scarlett...
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Larry Head-Fi Feedback
Oct 09 Colorado CanJam @ RMAF Impressions
SEE PUBLIC PROFILE "ABOUT ME" FOR LINKS TO REVIEWS AND MY GEAR.
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11-10-2008, 11:39 PM
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1000+ Head-Fi'er
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Join Date: Dec 2006
Location: Flagstaff, AZ
Posts: 1,118
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OK, I have another power supply question :P
It seems difficult to find specs on Cisco supplies. When I search for PSA18U-480C, that seams to be the model # for Cisco P/N 34-1977-03. I got a hold of a 34-1977-04, but the model number says EADP-18FB. It still says 48V and 0.38A, but I can't find any documentation on the differences between the 2 P/N's.
Do you guys think this will work OK?
__________________
Work: FLACs->Foobar->BantamDAC->MHSS->HD580
Home: FLACs->Foobar->BantamDAC->SOHA II->HD650
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