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After producing glorious sound for six years, my left channel Paraglow II is no longer functioning.
A few days after I replaced the power cord, when I turned it on, the 2A3 flared, a hoorible sound emanated from my speaker, and the sound became scratchy and low. I changed tubes but the sound stayed with the amp.
The voltages are
1. 376
2. 376
3. 458
10. 190
A1. 190
A2. 440
A3. 148
A4. 192
B1. 148
B2. 0
B3. 1.99
B6. 151
After checking the archives it seems that my voltages, with the exception of B6 which is only 159v, seem to be within acceptable limits, although 10, A1, A4 and B1 are up quite a bit from earlier checks. The leds on the C4S light but the adjustment on the W104 4y [is this a variable resistor?] doesn't seem to change the voltage at all. I read Paul's comment that B6 needs to be higher than B1 by 50 volts to work properly.
Does this suggest that the LT1431IZ has bitten the dust or?
Any help would be reeeally appreciated as I have only a few momo records and I can only listen to 50's rock for so long.
thanks
Bryon
Follow Ups:
nt
Triamp... Take a load off!
We worked on this problem a while back. I was hoping to get all the stats to put up a troubleshooting page for the old Paraglow II, but NuTube still has all the info.
He should be able to help you out. If not, please contact me offline and I will provide whatever help I can. It was your original posting of all voltages that helped me work on it the first time, so I owe you.
Triamp... Take a load off!
When you guys do pull info like this together, please let me know. I am working on a new forum that has logical categories for archiving this kind of info. I hope to have the first cut of it running by the end of the week. Hopefully it will be a more functional forum for the community, being broken down by kit and by other areas of interest like speakers, phono cartridges, etc. I will probably start it up and keep this forum for a month or two with the idea that we might all grab some useful bits that are scattered in it over the past ten years' archives and transfer them to stickies in the appropriate category on the new forum.
Edits: 10/05/09
That would be great.
I have what I think is a schematic of the shunt reg board with target voltage and current values. I also have what I think are part numbers for ordering replacement parts, as well as how and where to add resistance to make it less prone to failure.
What I don't have are pics of the top and bottom of the board to verify the circuit that I put together based on my PGII manual and conversation here on the Forum. My PGII's are pretty much inaccessible for now.
When the category based forum is set up, it would probably be easy to follow through on verifying the circuit. Someone could post some pics and compare it to the schematic. Then forum members could offer suggestions to improve upon it.
Triamp... Take a load off!
It sure looks like the shunt regulator board has bit the dust. Whether it's a bad component or a bad connection or both, is hard to say without some diagnostics. I think someone else has had a similar problem - hopefully they will see this and post their experience.
Unfortunately, neither the board nor the Paraglow are my design, and I don't have examples or manuals of either on hand. So I can't provide much help beyond basic theory.
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