CPP
Active member
The look heavy but so cool. Thanks for sharing
Are you using dedicated 20- or 30-amp lines to feed each of them. I read each can draw as much as 2300 watts from your wall outlets :amazing:
A Friends DIY For Me
- Thread starter brad225
- Start date
The look heavy but so cool. Thanks for sharing
Are you using dedicated 20- or 30-amp lines to feed each of them. I read each can draw as much as 2300 watts from your wall outlets :amazing:
brad225
Well-known member
- Thread Author
- #42
They are CPP 180 lbs of dead weight. It's a good thing they have 2 sets of handles but, they are still a pain to move.
Yes, each amp is on a 30 amp circuit of its own.
It will be about a week short of 3 months when they return next week. I am so ready to listen to music again.
Yes, each amp is on a 30 amp circuit of its own.
It will be about a week short of 3 months when they return next week. I am so ready to listen to music again.
CPP
Active member
Unreal how heavy those are. YA need good friends for sure.
Dual 30 amps circuits. Now will these do double duty when it gets chilly
Seriously can't wait to hear your reaction when they get hooked up and playing tunes.
brad225
Well-known member
- Thread Author
- #44
I was told with the circuit changes and the KT120 tubes there would be less heat. In the 3 hours we sat and listened to them at Phil's there was probably 1/4 the heat as when the 6550 tubes were in there.
As I joked with Dave in a previous post. You can hold your hands an inch above the tubes and not get burned. That was not the case previously.
Woofer and Tweet has done cartoons about them, showing someone roasting hotdogs on a stick over them.
Nephews in their 20's, that work out, is once again a blessing.
As I joked with Dave in a previous post. You can hold your hands an inch above the tubes and not get burned. That was not the case previously.
Woofer and Tweet has done cartoons about them, showing someone roasting hotdogs on a stick over them.
Nephews in their 20's, that work out, is once again a blessing.
brad225
Well-known member
- Thread Author
- #45
Pic of removing them in November with one of my nephews.
We took them one at a time on a hand truck down ramps I put on an exterior set of stairs I was rebuilding. Between my oversized body, small space to step backwards between the ramps and no handrails. The first one was a bit uncomfortable. The second was much easier.
The advantage is my listening room is at the top of the stairs across the hall. Down side is one long set of stairs rather than 2 short sets inside.
We took them one at a time on a hand truck down ramps I put on an exterior set of stairs I was rebuilding. Between my oversized body, small space to step backwards between the ramps and no handrails. The first one was a bit uncomfortable. The second was much easier.
The advantage is my listening room is at the top of the stairs across the hall. Down side is one long set of stairs rather than 2 short sets inside.
Attachments
a.wayne
Well-known member
Opportunity to do reps before delivery was lost .. 
brad225
Well-known member
- Thread Author
- #47
Well, today was progress but not quite there yet.
Phil installed the FET's and 3 of the 4, Zero Offset Variable Resistors immediately allowed the + and - side of the current flowing through them to "0" out on the meter. One of them was still unstable and not responding as it should.
Soooooooo, He is ordering 4 new ZOVR's from his supplier in Canada today and changing them to a higher voltage for safety sake. If one has issues it is only a matter of time for the others.
My beloved wife of 49 years is beginning to lose her any sense of humor and understanding of this project. She is a CPA working with 1-9 +0 and mechanical things don't compute well in her mind.
I tried the explanation of, taking your car in the shop because the engine is running a bit rough.
A best calculation of the issue is thought out and something replaced or cleaned. If that doesn't work the mechanic moves to the next part that could be it.
You don't just replace the engine.
She clearly understood but wasn't swayed much in thinking, this could still be 2 very fancy rabbit holes I have at Phil's.
She did though, after kissing me good night say she was sorry about my parts. I then laid there for a moment, wondering if she meant the 17 year old amps or my 69 year old parts. I'm going with the amps.
Hopefully by the end of the week, parts should be here, again.
Phil installed the FET's and 3 of the 4, Zero Offset Variable Resistors immediately allowed the + and - side of the current flowing through them to "0" out on the meter. One of them was still unstable and not responding as it should.
Soooooooo, He is ordering 4 new ZOVR's from his supplier in Canada today and changing them to a higher voltage for safety sake. If one has issues it is only a matter of time for the others.
My beloved wife of 49 years is beginning to lose her any sense of humor and understanding of this project. She is a CPA working with 1-9 +0 and mechanical things don't compute well in her mind.
I tried the explanation of, taking your car in the shop because the engine is running a bit rough.
A best calculation of the issue is thought out and something replaced or cleaned. If that doesn't work the mechanic moves to the next part that could be it.
You don't just replace the engine.
She clearly understood but wasn't swayed much in thinking, this could still be 2 very fancy rabbit holes I have at Phil's.
She did though, after kissing me good night say she was sorry about my parts. I then laid there for a moment, wondering if she meant the 17 year old amps or my 69 year old parts. I'm going with the amps.
Hopefully by the end of the week, parts should be here, again.
brad225
Well-known member
- Thread Author
- #49
Variable Resistors are set to arrive on Wednesday. So, Thursday morning I'm ready for 6 or 7 or..... whatever, of.
This time, they will be ready to pull the tubes, close the sides and top and prep them for coming home.
I know, I probably jinx myself each time I make the prediction but one of these times it will happen.
This time, they will be ready to pull the tubes, close the sides and top and prep them for coming home.
I know, I probably jinx myself each time I make the prediction but one of these times it will happen.
turnerfedlix
New member
[emoji106]
Sent from my SM-G965U using Tapatalk
Sent from my SM-G965U using Tapatalk
Michaels HiFi
Well-known member
It is literally SOLID ICE out my window. Everything - including fast food restaurants and such are shut down.
I actually had to go without getting my morning iced coffee today. <gasp>
CPP
Active member
No ice coffee out? The inhumanity of it all.anic:
I'm doing my part from Florida Michael. I just put ice in my tequila.
Oh yes, its another day of shorts and tee shirts :satisfying:
Michaels HiFi
Well-known member
Well I just tried the roads and they aren't that bad for the first time. But EVERYTHING is still shut down.
I read in the news yesterday the police were delivering medicines to those in need so people wouldn't have to try and drive. I was wondering if Iced Coffee withdrawals qualified for that....
Good news is we'll be back in the 60's Sunday.
brad225
Well-known member
- Thread Author
- #56
So, the parts came in and the install commenced. They are a major improvement in their ability to adjust + & - current to "0" without fluctuating up and down a few tenths or hundredths.
One of them still doesn't want to "0" out so Phil is going to start tracing back through some parts he didn't test. He believes that that are going to be a couple of weak resistors to replace.
I again, told him I was sorry for the problems the amp was giving him. His response, again was.
No, its fine. I love figuring these things out.
Says the guy that woke up at 2:24AM Thursday and was thinking about the amps. He got up and installed all of the new parts he had prepped for, went back to bed at 5:45 and fell asleep till 10AM.
*Another learning session for me. I asked him "Is it detrimental to the amps if that one doesn't "0" out?" He said no, but.
Think of the wave the electricity as it makes sweep from + to - up and down.
If it is not able to zero out then it will cut off the top or bottom of the wave depending whether it is the + or - that is not zeroed out.
As the wave is cut off so are the dynamics of current, hence, the dynamics of the sound you hear.
I have learned a lot. I just don't have the ability to apply it. That is what the professionals are for.
One of them still doesn't want to "0" out so Phil is going to start tracing back through some parts he didn't test. He believes that that are going to be a couple of weak resistors to replace.
I again, told him I was sorry for the problems the amp was giving him. His response, again was.
No, its fine. I love figuring these things out.
Says the guy that woke up at 2:24AM Thursday and was thinking about the amps. He got up and installed all of the new parts he had prepped for, went back to bed at 5:45 and fell asleep till 10AM.
*Another learning session for me. I asked him "Is it detrimental to the amps if that one doesn't "0" out?" He said no, but.
Think of the wave the electricity as it makes sweep from + to - up and down.
If it is not able to zero out then it will cut off the top or bottom of the wave depending whether it is the + or - that is not zeroed out.
As the wave is cut off so are the dynamics of current, hence, the dynamics of the sound you hear.
I have learned a lot. I just don't have the ability to apply it. That is what the professionals are for.
Michaels HiFi
Well-known member
I would LOVE to be but unfortunately it did not work out with my "real-life" schedule this year.
brad225
Well-known member
- Thread Author
- #59
Swing and a miss, yet again. Phil has cleaned all of the boards and cleaned all connections that are detachable for that one side of the amp. ARC suggested it may be something in the main control board on the front panel of the amp.
After a thorough check, he removed the front of the good amp and installed it on the non zeroing amp and the problem still exists.
I spoke with him last evening and he is going to remove all of the parts related to the KT120 upgrade path for that side of the amp. Possibly one of the parts has issues.
More to follow in the story of.... Phil & Brad verses the 610t.
After a thorough check, he removed the front of the good amp and installed it on the non zeroing amp and the problem still exists.
I spoke with him last evening and he is going to remove all of the parts related to the KT120 upgrade path for that side of the amp. Possibly one of the parts has issues.
More to follow in the story of.... Phil & Brad verses the 610t.
brad225
Well-known member
- Thread Author
- #60
It looks like the problem has an answer.
Yesterday Phil did a diagram of the entire bias circuit with values large enough to make notes on it.
This morning he started unsoldering some parts to test values and found 5 resistors on the "non zeroing" side of the amp that were nothing like the schematic or the resistors on the other side of the amp. Their values or markings were not there on any of them. Phil mentioned other parts that they had removed any identifying marks in the past, probably for proprietary design reasons.
He texted today me and said the believes he found the problem being, the 5 resistors.
An hour later he called to tell me that he had received an email from Greg at ARC. Greg said that he found an engineer that had been there long enough that he remembered an issue they encountered with the bias circuitry.
Apparently during production they ran out of the parts that were originally designed to be used and changed the 5 resistors in different places (with no markings) and never put it on the original schematics. So, the only people that ever knew were the engineers and the person installing the parts.
The weeks Phil has been trying to figure this out is a design change with no public record. Pardon my language but, that is F-ed up. I guess, the only good news is that they owned up to the unrecorded change and gave us the correct information.
They do have the original correct parts and will sell them to us so Phil is ordering them today.
As one of my pair of amps has both configurations I asked Phil to find out what year my amp was assembled. It would seem, it was possibly the first one, hence, the different design on each side of the same amp.
I am so thankful for Phil. I don’t think I could find anyone else that would have the patience and curiosity to make this happen. To say nothing of the labor bill if I didn’t trade my furniture making skills for his EE skills.
Hopefully my next post will be confirmation of the problem being corrected.
Yesterday Phil did a diagram of the entire bias circuit with values large enough to make notes on it.
This morning he started unsoldering some parts to test values and found 5 resistors on the "non zeroing" side of the amp that were nothing like the schematic or the resistors on the other side of the amp. Their values or markings were not there on any of them. Phil mentioned other parts that they had removed any identifying marks in the past, probably for proprietary design reasons.
He texted today me and said the believes he found the problem being, the 5 resistors.
An hour later he called to tell me that he had received an email from Greg at ARC. Greg said that he found an engineer that had been there long enough that he remembered an issue they encountered with the bias circuitry.
Apparently during production they ran out of the parts that were originally designed to be used and changed the 5 resistors in different places (with no markings) and never put it on the original schematics. So, the only people that ever knew were the engineers and the person installing the parts.
The weeks Phil has been trying to figure this out is a design change with no public record. Pardon my language but, that is F-ed up. I guess, the only good news is that they owned up to the unrecorded change and gave us the correct information.
They do have the original correct parts and will sell them to us so Phil is ordering them today.
As one of my pair of amps has both configurations I asked Phil to find out what year my amp was assembled. It would seem, it was possibly the first one, hence, the different design on each side of the same amp.
I am so thankful for Phil. I don’t think I could find anyone else that would have the patience and curiosity to make this happen. To say nothing of the labor bill if I didn’t trade my furniture making skills for his EE skills.
Hopefully my next post will be confirmation of the problem being corrected.