RDO-198 Polarity in SDA 2B
PreCd
Posts: 786
I am just finishing up on the TL 2B mod for my SDA 2Bs and am wondering about the polarity on the new tweeters. I need to change one of the small spades to large but which one is it? Black wire or white wire?
SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp
Post edited by PreCd on
Comments
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BlackPolitical 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 -
Sorry Jesse but it's the white one (Ground)“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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Thank you Tony, you're correct.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 -
Shifting topic a bit here but I have another little problem possibly. Upon completing the installation of my 5.8uf cap I checked it with a multimeter. I cannot get a reading on it. It meters ok on ohms but nothing on uF mode except the standard OL reading. All the other caps on the board check good. Any suggestions?SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp -
Your welcome Mr. Jesse :cheesygrin:“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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Shifting topic a bit here but I have another little problem possibly. Upon completing the installation of my 5.8uf cap I checked it with a multimeter. I cannot get a reading on it. It meters ok on ohms but nothing on uF mode except the standard OL reading. All the other caps on the board check good. Any suggestions?
Are you checking it in circuit or out of circuit, if in circuit remember that cap is being bypassed by a resistor.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
In circuit. Is this normal then? Sorry if that sounds like a stupid question but pretty new to this.SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp -
This is most likely your problem. Ideally you should check component values out of circuit and by them self's. You could just remove the cap and check it.
BTW There are no stupid questions for the most part, If you don't know you don't know and should ask.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
Thanks gimpod. I took the 5.8uf Sonicap out of circuit and it checked exactly 5.8uf. Put it back in and I am getting no reading on it so would the resistor knock it out like that? I went ahead and installed the crossover and things sound good on the one speaker. The other is next. Here is what I did:
Un-installed the old resistor replacing it with a 2.7k 15watt Mills. Installed per F1nut's instructions (R2 hole and "G")
Installed 5.8uf Sonicap putting one end into the top "C5" hole and the other in "H"
Replaced the polyswitch with a .9amp polyswitch (I listen loud sometimes so better safe than sorry).
Left the old bypass in there to see our it sounds, figured I could always take it out if needed.
Replaced the other caps.This is most likely your problem. Ideally you should check component values out of circuit and by them self's. You could just remove the cap and check it.
BTW There are no stupid questions for the most part, If you don't know you don't know and should ask.SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp -
Thanks gimpod. I took the 5.8uf Sonicap out of circuit and it checked exactly 5.8uf. Put it back in and I am getting no reading on it so would the resistor knock it out like that?
Yes.Un-installed the old resistor replacing it with a 2.7k 15watt Mills. Installed per F1nut's instructions (R2 hole and "G")
Installed 5.8uf Sonicap putting one end into the top "C5" hole and the other in "H"
Replaced the polyswitch with a .9amp polyswitch (I listen loud sometimes so better safe than sorry).
Left the old bypass in there to see our it sounds, figured I could always take it out if needed.
Replaced the other caps.
This doesn't sound right. To begin with that resistor should be a 2.7 Ohm not a 2.7k and should be installed in holes B and G, R2 should have a jumper there. That 5.8uF cap is fine where it's at. Just go ahead and remove that old bypass cap (C4) as it's not needed with that 12uF Sonicap (C3).“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
Tony, I think and hope that Kevin simply wrote that info incorrectly and in fact it is a 2.7 ohm, 12 watt mills. I do know that instead of using B, he used the unused hole in R2 and retained the jumper.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 -
Oops! Yes F1nut is correct it was 2.7 OHM resistor. Sorry about that and thank you for keeping up with me. My fingers got ahead of my head.
One more question. Does it matter which lead the P and R go to from the circuit board to the voice coil? I thought I had it licked and knew exactly where it went then I had a uh oh moment.
Thanks.
KevniYes.
This doesn't sound right. To begin with that resistor should be a 2.7 Ohm not a 2.7k and should be installed in holes B and G, R2 should have a jumper there. That 5.8uF cap is fine where it's at. Just go ahead and remove that old bypass cap (C4) as it's not needed with that 12uF Sonicap (C3).SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp -
Oops! Yes F1nut is correct it was 2.7 OHM resistor. Sorry about that and thank you for keeping up with me. My fingers got ahead of my head.
One more question. Does it matter which lead the P and R go to from the circuit board to the voice coil? I thought I had it licked and knew exactly where it went then I had a uh oh moment.
Thanks.
Kevni
No problem my brain has a hard time keeping up with my fingers too.
No it doesn't matter on the leads from P & R. BTW it's an inductor (Big round thing the board mounts to) not a voice coil.
“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain -
Awesome! Well it is done. And I have put on some music to test. Dianna Krall live in Paris. Should tell me a little about the love I give them.
Thanks for your input and help.
KevinNo problem my brain has a hard time keeping up with my fingers too.
No it doesn't matter on the leads from P & R. BTW it's an inductor (Big round thing the board mounts to) not a voice coil.SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp -
Your welcome just glad I could help.“The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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As a heads up, you may not be happy right away as Sonicaps can take a while to blossom.
Not apples to apples I know, but just today I dropped a 1 ohm 12 watt Mills and 13.5uf Sonicap into just the left speaker of my son's Monitor 5jr+'s. For the first couple of hours the left side sounded bad. After seven or eight hours things were better, but still not as good as the untouched right channel,VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
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I can see a large improvement already so that is good news. I believe much of my problem was the poly switches. Over the past 24 years I have had these speakers I cannot count the times I have tripped them. My previous amp was not suited for these speakers and I just a few months ago purchased a amp that would drive the SDA 2Bs, a Adcom GFA-555. I replaced the Polys today because I do like it louder at times. Probably hurts my sound some but it is insurance for me.
Have all the caps for the GFA-555 and preamp so they are next on the list.
The TL2B sounds good at this point and again I am glad to hear that they will only get better.
O and by the way I did not go with all Sonicaps all around. The electros got replaced with the same from Erse and the 12uf got a Erse Pulse X capacitor. I also left the bypass cap in there just to see how everything went. I just could not justify putting that much money into the Sonicaps even though I can see the quality difference between them and the Erse. I did put the Sonicap in the 5.8uf slot though and used the Mills capacitor.
Thanks for all your advice.inspiredsports wrote: »As a heads up, you may not be happy right away as Sonicaps can take a while to blossom.
Not apples to apples I know, but just today I dropped a 1 ohm 12 watt Mills and 13.5uf Sonicap into just the left speaker of my son's Monitor 5jr+'s. For the first couple of hours the left side sounded bad. After seven or eight hours things were better, but still not as good as the untouched right channel,SDA2BTL
Marantz CD5004
Adcom GFA-545
Bottlehead Quickie Tube Preamp
