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kve777Offline
#1 Posted: Sunday, March 19, 2017 12:51:04 AM(UTC)
 
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kve777

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I'm in the home stretch with my first, MKII, an M-500t MKII for Loner_T. He'll be by tomorrow and I'd love for him to at least see and hear it, even if it's not 100% done. Anyway, I plugged it into my Variac, turned it on, slowly brought it up to 117V. No fireworks. Relay clicked on. Promising! Next I tried adjusting the rail voltage. All I could get was 70V. Hmmm. Doh! I had dropped the Variac to 60V when I left the room to get my DVOM. Brought it back up to 117V and 90.0V was easily attained at about 3/4 rotation of SRV503.
  I'll fine tune Bias after I've run it a while.
Now to hook up a source and speakers! Fingers crossed!
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakersare used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59
8 users thanked kve777 for this useful post.
loner_t on 3/19/2017(UTC), aslan7 on 3/19/2017(UTC), zumbini on 3/19/2017(UTC), danowood on 3/19/2017(UTC), PDR on 3/19/2017(UTC), Ar9Jim on 3/19/2017(UTC), Charlie on 3/19/2017(UTC), dcl on 3/19/2017(UTC)
BalokOffline
#2 Posted: Sunday, March 19, 2017 1:17:31 AM(UTC)
 
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Balok

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Nice work Kevin.  Maybe break her in with some Chuck Berry.  
"ALL THINGS MUST PASS"
kve777Offline
#3 Posted: Sunday, March 19, 2017 1:30:30 AM(UTC)
 
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kve777

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And...no sound
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakersare used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59
Nahash5150Offline
#4 Posted: Sunday, March 19, 2017 1:42:32 AM(UTC)
 
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Don't worry - your first mkII always blows. Just grab a beer and watch the fireworks. 
"The greatest leader is not necessarily the one who does the greatest things. He is the one that gets the people to do the greatest things." – Ronald Reagan


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kve777Offline
#5 Posted: Sunday, March 19, 2017 2:37:27 AM(UTC)
 
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There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakersare used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59
4 users thanked kve777 for this useful post.
loner_t on 3/19/2017(UTC), Ar9Jim on 3/19/2017(UTC), Charlie on 3/19/2017(UTC), dcl on 3/19/2017(UTC)
DaddyjtOffline
#6 Posted: Sunday, March 19, 2017 2:41:18 AM(UTC)
 
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Check D.C. Offset...

Can you adjust bias?
Theater room: Marantz 7005, 2x 1.0t mkII to Infinity Kappa 9s, 1.0t mkII bi-amped to Klipsch RC7 (I know, WAY overkill), A 705x to Klipsch RS7s surrounds, and Klipsch RS7s back. Velodyne DD12, ProJect RPM 1.3 into ProJect tube box S, Oppo BDP 105 & 95, Woo WA6 tube headphone amp, Sony Playstation 3, and Sharp Aquious 70". Monster power center (x2), Doug's interconnects, and Kimber 8tc.

2 channel system: Original Bill D C1, Silver 9t mono blocks, Infinity Kappa 9s, and Oppo 95.

Amp test/"mini" system: B-Man C1 (Remote volume), Whatever amp I'm testing, Klipsch RF7 pair, Carver 490t (Gene C refurb).

Family room system: Sony ES receiver, A400x, Polk LS 70s, Polk CS 350, Polk LS FX, Sony Blue ray, X Box 360, Wii, Vizeo 55" LED.

Garage system: Pioneer Elite 45x, Infinity Kappa 5s, Ipod interface.

Bench: 4x 500t awaiting mkII, 7x 1.0t awaiting mkII, C1 needing Bill D mods, Polk SDA SRS pair needing refresh, ALIII pair needing some TLC.

Closet: M 500 t Original Bill D refresh, TFM 4.0 black face (x2), Silver 9t pair needing refresh, M1.5T needing refresh, 1.0t Kall mod, TFM 55x (x2), Kappa 8.1 pair, NHT 2.5 pair, AL Silver pair needing refresh.
kve777Offline
#7 Posted: Sunday, March 19, 2017 2:43:24 AM(UTC)
 
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kve777

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Nope! No bias adjust. I'll tackle it tomorrow. At least no sparks.
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakersare used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59
wrfOnline
#8 Posted: Sunday, March 19, 2017 1:53:54 PM(UTC)
 
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The good news is that the relay is clicking.  
 
Of course this has NeeevvveeerrYikes   happened to me.  But if it did, here's what I would check first.
 
- Did you actually solder the bias pots.  They are very easy to overlook.
- Double check part numbers and orientation of all small transistors on the amp board.  They are easy to mix up.  I've actually started to mark the emitter side of each transistor with a silver marker since the board has the emitter marked.  That way if this ever did happen to me I could double check with a quick glance.
- Solder bridges on the small transistors.  Amazingly easy to do because of the close spacing of the pads and sometimes difficult to see.
 
Good luck. 
 
Main System
Thiel CS2.4 Speakers, Emotive Ultra-12 Subwoofer, BAT VK-600SE Amplifier, BAT VK-52SE Preamp, Slim Devices Squeezebox Transporter, Carver TX-11B, Oppo BD-105 used for DVD's and SACD.
Garage System
Carver M-1.0t Mk II Opt 002 (WRF Built), Logitech Squeezebox Transporter, BAT VK-31 Preamp, Martin Logan reQuest
kve777Offline
#9 Posted: Sunday, March 19, 2017 2:01:49 PM(UTC)
 
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kve777

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wrf;299059 wrote:
The good news is that the relay is clicking.  
 
Of course this has NeeevvveeerrYikes   happened to me.  But if it did, here's what I would check first.
 
- Did you actually solder the bias pots.  They are very easy to overlook.
- Double check part numbers and orientation of all small transistors on the amp board.  They are easy to mix up.  I've actually started to mark the emitter side of each transistor with a silver marker since the board has the emitter marked.  That way if this ever did happen to me I could double check with a quick glance.
- Solder bridges on the small transistors.  Amazingly easy to do because of the close spacing of the pads and sometimes difficult to see.
 
Good luck. 
 
Solder on the bias pots, CHECK. Voltages to 4 & 8 on IC101, CHECK. 
 I had the IC in backwards. The 'dot' I saw on the board is a '5', who the f%&# puts a 5 that you can't read? I'm gonna hafta pull out the sig-gen and scope. I need to get used to the layout. I don't know where everything is, yet, like I do on the C-1.
 
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakersare used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59
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