SDA 1
Answers
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Gardenstater wrote: »I made a mistake. it was the .5uf not 5.8. too early to talk tech evidently this a.m. I remember the cap just didn't remember the value.
If I think about it after work I'll take a picture of my XO to help relive your anxiety
I hear that. What about the 3 inductors that yours "never had"?
It's more like Engineer's OCD than anxiety
Read step 4 Z-network that is what I was referring to. Mine did not come with that network. I'm assuming that was the 3rd big coil you were referring to. YES mine has the normal inductors on the board.
OK gotcha. That's a wrap then lol. No, the "Z-Network" (as Polk called it....probably short for Zobel) was apparently a 55 uF cap in series with two paralleled 7.5 Ohm resistors. So it was basically a cap and resistance in series.
@DarqueKnight please disregard my attn: above.
Not trying to be a fact checker (uggh). It all started with my curiosity and now I *think* we are back full circle to that forum quote actually *is* in error because there was never a reduction of inductors from 3 to 2. Phew. Sorry everyone.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
@pitdogg2 said:
The SDA1a had a small round binding post cup and no fuses.
Picture of terminal cup on my 1As in storage.
"Sometimes you have to look to the past to understand where you are going in the future"Anger is just anger. It isn’t good. It isn’t bad. It just is. What you do with it is what matters.
You can use it to build or to destroy. You just have to make the choice. Jim Butcher
Harry / Marietta GA -
I have exactly the same ones and bought them in San Francisco back in 1985 asd SDA1.
They still deliver a great sound without having had to replace anything.
People here in France are always amazed when listening to them.
Now I know I can find all the necessary info if I ever have to fix them.
Polk SDA1
Marantz CD63 mkII KI
Lynn Basik turntable
Taga PF2000 power filter
Cambridge CXN Streamer / DAC
Yves Cochet PS-1 tube preamp
Yves Cochet ALS-1 tube power amp
Boite Noire power filter and rectifier for amp
and obviously excellent interconnect and speaker cables
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I have exactly the same ones and bought them in San Francisco back in 1985 asd SDA1.
They still deliver a great sound without having had to replace anything.
People here in France are always amazed when listening to them.
Now I know I can find all the necessary info if I ever have to fix them.
Polk SDA1
Marantz CD63 mkII KI
Lynn Basik turntable
Taga PF2000 power filter
Cambridge CXN Streamer / DAC
Yves Cochet PS-1 tube preamp
Yves Cochet ALS-1 tube power amp
Boite Noire power filter and rectifier for amp
and obviously excellent interconnect and speaker cables
Welcome to Club Polk
You'd be amazed at how much better they would sound by upgrading the crossover components. The original electrolytic caps are way past their lifespan and will be out of spec.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Another one of Polk's early abandoned experiments?Don't take experimental gene therapies from known eugenicists. -
Most early Polk speakers sat on baffle. The cut out is definitely peerless/sl1000. I misread your post as you meant (I think) that it was not routed to inset the driver into the baffle.
