Just picked up an Adcom GFA-5800 (broken)
Comments
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I just need to get more sleep
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This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's -
Yes Mega he scares me. He brings back memories of polarized caps being inserted backwards in my first amp project. Lots of stinky explosions!
I did that just to see what it does.... Well there's wasn't much left of the cap :eek:
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
I dove under the table like there was a drive by and unplugged the amp. It was all over except the pungent smell of the exploded caps.Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
I looked at the schema of this amp and there are one AC main fuse (15A) and two voltage gain amplifier fuse of 0.5A each for driver stage.
There are also two output protection fuse of 10A each for overloading protection (short circuit).
There is no DC protection circuitry as with many other NP amps. This is one of the as simple as it gets amp.Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
When using a light bulb for an amp, what wattage/resistance bulb is best
I'll have to get my list
I think to use 100W for starter just to be safe when trying to test it out and measures a few critical voltage at different components.
But this amp consumes 250W idle so I think the light bulb is not gonna get dim even when the caps are charged. You'll need to use 300W to even witness the lightbulb dims a bit when the caps are fully charged and the amp is working normally.Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
On another note, I built a series in-line Light bulb outlet.
...
I stood in Home Depot for a little while trying to figure out the best and easiest way to do this, with no exposed wiring, and nothing involving mounting anything in a project box, etc.
Pretty darn simple--The two receptables are split and wired in series, with the light bulb adapter (and light bulb) completing the Neutral part of the circuit in the top receptacle.
With the bulb in place I have 120V at the bottom outlet. No bulb, no voltage. Optionally I could just plug any standard lamp into the top receptacle instead of the bulb adapter thingey.
The completed project:
The wiring:
The next phase might be to put this into a project box or dbl gang box, and include a shorting switch and an ammeter.____________________
This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's -
OK, so on a Variac---if price is essentially the same:
New 5A (made in China)
or
Used 10A (Made in the US, STACO)
??
Is this one of those things where they don't make em like they used to?
Are the new China builds decent?
Will I ever need 10A, or will 5A do for most purposes? I'm guessing that if you get up above that you might as well run full power without the Variac right?____________________
This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's -
Call me old school but while I was learning electronics, we only had a 5 amp VARIAC around, but that was like 25+ years ago. If I remember correctly it didn't even have a voltage meter on it, which I find idiot thing today if you can't figure dail above. A meter should be current if anything not voltage just me I know since they all come that way. Remember you're testing not playing the unit so 5 amps is more then enough. Just my $.02
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
I stood in Home Depot for a little while trying to figure out the best and easiest way to do this, with no exposed wiring, and nothing involving mounting anything in a project box, etc.
Pretty darn simple--The two receptables are split and wired in series, with the light bulb adapter (and light bulb) completing the Neutral part of the circuit in the top receptacle.
With the bulb in place I have 120V at the bottom outlet. No bulb, no voltage. Optionally I could just plug any standard lamp into the top receptacle instead of the bulb adapter thingey.
The completed project:
The wiring:
The next phase might be to put this into a project box or dbl gang box, and include a shorting switch and an ammeter.
Now find yourself a 3 way lamp around with say 50/100/150 or a 40/80/120 bulb and start with the low setting. You can always turn up the current by turning the lamp to a higher setting. I played with stuff, but was a kid with no cash most of the time.
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
I didn't have a 3 way lamp hanging around so I bought a 100, a 200, and a 300 watt clear bulbdisneyjoe7 wrote: »Now find yourself a 3 way lamp around with say 50/100/150 or a 40/80/120 bulb and start with the low setting. You can always turn up the current by turning the lamp to a higher setting. I played with stuff, but was a kid with no cash most of the time.____________________
This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's -
disneyjoe7 wrote: »Call me old school but while I was learning electronics, we only had a 5 amp VARIAC around, but that was like 25+ years ago. If I remember correctly it didn't even have a voltage meter on it, which I find idiot thing today if you can't figure dail above. A meter should be current if anything not voltage just me I know since they all come that way. Remember you're testing not playing the unit so 5 amps is more then enough. Just my $.02
How about this thing--it ought to take care of any Variac need I can possibly imagine :eek::eek:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110448390655&ssPageName=STRK:MEWAX:IT
Its only $100 (plus freight) ____________________
This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's -
No it looked like that $50 one you're looking at. If you did the light bulb thing, I would start with a smaller watt bulb.
Speakers
Carver Amazing Fronts
CS400i Center
RT800i's Rears
Sub Paradigm Servo 15
Electronics
Conrad Johnson PV-5 pre-amp
Parasound Halo A23
Pioneer 84TXSi AVR
Pioneer 79Avi DVD
Sony CX400 CD changer
Panasonic 42-PX60U Plasma
WMC Win7 32bit HD DVR -
Good job on making the light bulb thingy! Looks neat and safe to me!
Staco Variac is a good one but it's old. Don't know it'll work correctly or you need to replace carbon brush, etc.
Buying new will ensure it'll work out of the box mostly.Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
I might have to take my chances with Newark and hope to get matched parts, I got no responses except from the Adcom recommended place, and only after I emailed them again, I sent a detailed list of what I need and asked if they can provide and if so to let me kow how much. This is all that was in thier email:
That's it.we have parts partualy
not all in stock
You'd think that in these times businesses would do a little more to help promote a sale. WTF?!! Frustrating!____________________
This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.
HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
Pool: Atrium 60's/45's
