Johnny D's 700 Adventure
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Re: Phase Linear 400
Talking Phas Linear 400 amps. Is there a preference for the version with 4 heat sink fins VS the version with the 8 fins? I know ther is more area for heat transfer with the 8 fins, but internally is one version better than another. Also there is the numbering scheme. The ones with three or four digits and then a - and then three or four more numbers VS the ones with the five digit serial number...............
They may be pretty much all the same with the exception of the PCB which will be changed out anyway....but thought this might be an interesting topic for conversation...
Thanks for any observations and discussion
Talking Phas Linear 400 amps. Is there a preference for the version with 4 heat sink fins VS the version with the 8 fins? I know ther is more area for heat transfer with the 8 fins, but internally is one version better than another. Also there is the numbering scheme. The ones with three or four digits and then a - and then three or four more numbers VS the ones with the five digit serial number...............
They may be pretty much all the same with the exception of the PCB which will be changed out anyway....but thought this might be an interesting topic for conversation...
Thanks for any observations and discussion
Re: Phase Linear 400
Joe/Lee
Finish putting amp together, having problem...keep blowing the line fuse...could it be the 22k caps pulling to much on start up? None of the output fuses blew so I'm thinking the turn on surge it blowing the fuses. Have a watt/amp meter with bulb test and for a split second thought I seen 12amps. When you guys did your cap upgrades did you use a larger line fuse?
Joe/Lee
Finish putting amp together, having problem...keep blowing the line fuse...could it be the 22k caps pulling to much on start up? None of the output fuses blew so I'm thinking the turn on surge it blowing the fuses. Have a watt/amp meter with bulb test and for a split second thought I seen 12amps. When you guys did your cap upgrades did you use a larger line fuse?
Re: Phase Linear 400
ok, put old caps in bulb test, good...pluged direct and all is good. Relays pulled in and was able to test offset so everything seemd to test good and no blown fuses. Possibly caps bad?? Meter only goes to 10k uf so going to have to parallel caps to see if registers 10k but if 11 meter will read OL..
ok, put old caps in bulb test, good...pluged direct and all is good. Relays pulled in and was able to test offset so everything seemd to test good and no blown fuses. Possibly caps bad?? Meter only goes to 10k uf so going to have to parallel caps to see if registers 10k but if 11 meter will read OL..
- Joined
- Jan 14, 2011
- Messages
- 74,951
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
- Joined
- Jan 14, 2011
- Messages
- 74,951
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Re: Phase Linear 400
John I've put in 12 sets of those PS caps and haven't blown a line fuse. Bypass the power switch, they are notorious for shorting on an intermittent basis. Could be the lower draw of the old caps are not enough to get it to arc. Does it have the monstrosity plate and microswitch setup, or the small brown one??
John I've put in 12 sets of those PS caps and haven't blown a line fuse. Bypass the power switch, they are notorious for shorting on an intermittent basis. Could be the lower draw of the old caps are not enough to get it to arc. Does it have the monstrosity plate and microswitch setup, or the small brown one??
Re: Phase Linear 400
Lee, formed them for almost 2 days, then let them bleed down while changed the dc protect power feed. Installed caps and did bulb test, was good. can't test caps cause my meter on goes to 10,000uf. Paralled them but meter registered OL...probably over 10,000.
But like i said installed old caps and everything was fine. Has to be inrush to charge caps from dead 0.000vdc. Amp meter registered 32 amps at start then down to .4amps idle. Wondering if I should use 7amp slo-blo to see if that would start system for testing. I have to add shorting switch to my bulb rig and after amp charges short bulb terminals...will try tonight.
Lee, formed them for almost 2 days, then let them bleed down while changed the dc protect power feed. Installed caps and did bulb test, was good. can't test caps cause my meter on goes to 10,000uf. Paralled them but meter registered OL...probably over 10,000.
But like i said installed old caps and everything was fine. Has to be inrush to charge caps from dead 0.000vdc. Amp meter registered 32 amps at start then down to .4amps idle. Wondering if I should use 7amp slo-blo to see if that would start system for testing. I have to add shorting switch to my bulb rig and after amp charges short bulb terminals...will try tonight.
- Joined
- Jan 14, 2011
- Messages
- 74,951
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
- Joined
- Jan 14, 2011
- Messages
- 74,951
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Re: Phase Linear 400
Hi Lee
At turn on when the amp is totally bled down the initial power up blows the main line fuse, with the 22k caps. With the old caps in I can keep a 7 amp fuse in with no problem. It definitly a turn on surge or the caps have a issue, but everything is good with the bulb test. I checked the bridge like joe said but turned out fine. maybe research and slo-blo of a lower amprage that can handle the turn on surge? But of course react fast enough to a 10amp load.
Hi Lee
At turn on when the amp is totally bled down the initial power up blows the main line fuse, with the 22k caps. With the old caps in I can keep a 7 amp fuse in with no problem. It definitly a turn on surge or the caps have a issue, but everything is good with the bulb test. I checked the bridge like joe said but turned out fine. maybe research and slo-blo of a lower amprage that can handle the turn on surge? But of course react fast enough to a 10amp load.
- Joined
- Jan 14, 2011
- Messages
- 74,951
- Location
- Gillette, Wyo.
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- Halfbiass...Electron Herder and Backass Woof
Re: Phase Linear 400
I would continue to watch it John, check the condition of the caps until you are sure that it is OK. The specified fuse is an AGC type which is not a classic slow blow, but slower than the AGX instrument class fuses. What did you measure the cap leakage current at when you formed them at 100V?
I would continue to watch it John, check the condition of the caps until you are sure that it is OK. The specified fuse is an AGC type which is not a classic slow blow, but slower than the AGX instrument class fuses. What did you measure the cap leakage current at when you formed them at 100V?
Re: Phase Linear 400
The leakage was .00054, 1.2v across 2.2k resistor...hard to get acurate reading bouncing from1 to1.3 v, so I went in the middle. Used a td 8amp fuse.
Still have distortion in the one speaker and as I add the other channel it bleeds over then its in the both, but if I turn down the distorted channel and use the other channel its clean...
Driving me nuts, looking at schematic one of each channel see's .5v, when I measure its .9v.
The leakage was .00054, 1.2v across 2.2k resistor...hard to get acurate reading bouncing from1 to1.3 v, so I went in the middle. Used a td 8amp fuse.
Still have distortion in the one speaker and as I add the other channel it bleeds over then its in the both, but if I turn down the distorted channel and use the other channel its clean...
Driving me nuts, looking at schematic one of each channel see's .5v, when I measure its .9v.