The ultimate dual 500 "rising from the ashes" build
- Thread starter grapplesaw
- Start date
Thank you Joe. I had offered $7 for 10 pieces on on EBay but will cancel bid
Sky craft has then now for .34 cents each.
As we no longer have cents in Canada I do not know what to do!! This was all started when the Government removed cents from the Income tax forms may years ago and proving that they had no cense!! They re"cent"ly stopped make making the mighty penny to complete the full circle of Government incompetence in money management.
Happy New Year
Glen
Sky craft has then now for .34 cents each.
As we no longer have cents in Canada I do not know what to do!! This was all started when the Government removed cents from the Income tax forms may years ago and proving that they had no cense!! They re"cent"ly stopped make making the mighty penny to complete the full circle of Government incompetence in money management.
Happy New Year
Glen
So after a great Breakfast of scrambled eggs and Bacon and two episodes of Star Wars myth busters
I shall return to the project
So we have agreed to
-replace to output jacks with the 30 amp three way binding posts
-full complementary output
- move bridge rectifier to sit above the relay bank olininating ac running across the width of the chassis
-reroute the B+/- to run straight to the backplane away from the AC feed.
-keep original front panel wires they are Silver plated 90c wires. Lot of work and parts to replace
Still at hand today
- replace stock .39 ohm emitter resistors with .33 ohm. My thinking here is standard part only.
- deal with ground circuit design for the input jacks. As per previous post.
- relocate the small transformer mounting location. This has AC running from RRear to Lfront of unit.
Sorry
This the shot
I shall return to the project
So we have agreed to
-replace to output jacks with the 30 amp three way binding posts
-full complementary output
- move bridge rectifier to sit above the relay bank olininating ac running across the width of the chassis
-reroute the B+/- to run straight to the backplane away from the AC feed.
-keep original front panel wires they are Silver plated 90c wires. Lot of work and parts to replace
Still at hand today
- replace stock .39 ohm emitter resistors with .33 ohm. My thinking here is standard part only.
- deal with ground circuit design for the input jacks. As per previous post.
- relocate the small transformer mounting location. This has AC running from RRear to Lfront of unit.
Sorry
This the shot
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see full wiring documents here
http://forums.phxaudiotape.com/showthread.php/6202-Phase-Linear-Dual-500-schematics
http://forums.phxaudiotape.com/showthread.php/6202-Phase-Linear-Dual-500-schematics
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Hi Ed
If you have one there the original pieces please see if the dimensions from Skycraft are right. They do not add up in my book
Single-lugs
Non-grounding
Phenol Resin Support
Two Mounting Screw Points
Dimensions:
Metal Base: 2.55" (L) x 0.28" (W)
Mounting Hole Center to Center: 2.37"
Diameter of Mounting Hole: 0.15"
Maximum Height: 0.85"
Lug Center to Center Spacing: 0.42"
Lug Hole Size: 0.19" (H) x 0.11" (W)
If you have one there the original pieces please see if the dimensions from Skycraft are right. They do not add up in my book
Single-lugs
Non-grounding
Phenol Resin Support
Two Mounting Screw Points
Dimensions:
Metal Base: 2.55" (L) x 0.28" (W)
Mounting Hole Center to Center: 2.37"
Diameter of Mounting Hole: 0.15"
Maximum Height: 0.85"
Lug Center to Center Spacing: 0.42"
Lug Hole Size: 0.19" (H) x 0.11" (W)
Using .33 Ohm Versus Stock .39 ohm Emitter Resistors in a Phase Linear Dual 500/D-500
I am certainly no expert when it comes to "emitter degeneration", as it would be affected in a Dual 500/D-500, if you change the value of the stock .39 ohm resistors to .33 ohm.
Perhaps Joe or Lee could illuminate the subject a little better, before you make your final decision on using .33 ohm versus the stock .39 ohm resistors.
NOTE: Type in "emitter degeneration" on google and you will get a plethora of results.
Ed
I am certainly no expert when it comes to "emitter degeneration", as it would be affected in a Dual 500/D-500, if you change the value of the stock .39 ohm resistors to .33 ohm.
Perhaps Joe or Lee could illuminate the subject a little better, before you make your final decision on using .33 ohm versus the stock .39 ohm resistors.
NOTE: Type in "emitter degeneration" on google and you will get a plethora of results.
Ed
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GOOD CATCH!
The center to center distance is critical.
The HH Smith's are 2.250".
The Skycraft's appear to be 2.37"
I also verified the center to center distance of the HH Smith's I have with my dial calipers.
This .120" difference will not allow you to screw into the holes that are currently tapped into the back of the heat-sink.
Ed
- Joined
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The replacement starts
#12 collector wire installed. I have #14 for the base wire. Went to up some ferric beads on it but the hole is to small. After breaking one and being satisfied it would not go on I have to decide proceeding with the #14 without beads and using snap on type later if they are needed. Or go to the store and get some #16 solid core wire.
Any one used the snap on ones??
#12 collector wire installed. I have #14 for the base wire. Went to up some ferric beads on it but the hole is to small. After breaking one and being satisfied it would not go on I have to decide proceeding with the #14 without beads and using snap on type later if they are needed. Or go to the store and get some #16 solid core wire.
Any one used the snap on ones??
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- Joined
- Jan 14, 2011
- Messages
- 74,424
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
- Joined
- Jan 14, 2011
- Messages
- 74,424
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof
Some headway today
The old one
The First new backplate done. The second should be a little faster.
Cleaned up the Fuse holders and started removing old banana plugs. These were not original. The holes are oversized from stock. I will have to drill them some more to fit the heaven binding posts. No option now.
Check our how to run your equipment without fuses. Who knew!!
The old one
The First new backplate done. The second should be a little faster.
Cleaned up the Fuse holders and started removing old banana plugs. These were not original. The holes are oversized from stock. I will have to drill them some more to fit the heaven binding posts. No option now.
Check our how to run your equipment without fuses. Who knew!!
Attachments
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Spent several hours on mapping out wiring for full comp setup today. I have found that many errors are the 700 comp drawings. I will need to modify the out put stage on the cp boards and now have arranged all the wiring ( I hope) I found that the original wiring on this unit was different to the drawings and my other units. I am now sure this was a proto type unit.
One wire to decide on is the sensor for the high frequency unit. It was on the emitter side between the transistor and the emitter resistor. On B- side Haw the these are inverted I will move the wire to this same layout on the full comp set up.
One wire to decide on is the sensor for the high frequency unit. It was on the emitter side between the transistor and the emitter resistor. On B- side Haw the these are inverted I will move the wire to this same layout on the full comp set up.
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- Joined
- Jan 14, 2011
- Messages
- 74,424
- Location
- Gillette, Wyo.
- Tagline
- Halfbiass...Electron Herder and Backass Woof