I always wondered about that. Blown output devices I'd expect, but how the #@&$ do you blow up an input stage?
On second thoughts, nevermind - I'm probably happier not knowing.
I don't know , but he gets a kings ransom for them.
BTW , the IPS could see the FB from high level oscillation , the doubler could "bite the dust" and fry it , no snubbers (as nagsy suggested).. etc.. many #@&$ ways it could happen , especially with this design.
OS
that's the problem.
I recognise that I do not have extensive knowledge on designing and implementing Ground Planes.
I fear some of the consequences of parasitic capacitances and unintended mixing of current routes that come with Ground Planes.
It is only the fear of the unknown that drives me from Planes, whether Power or Ground.
i don't know where your fear is coming from, but the super leach amps i built using the board version from that posted in AUDIO magazine has ground planes......i thought the sound was fantastic, better than any other amps i have had a chance to listen to......
i ran a repair shop back then and i get to listen to each and every amp that is repaired in my shop before returning the unit to its owner.....that was back in the 80's to early 90's......
I sent this message to Nikosokey to day. I think it could be interesting for other members that have follow this thread.
Nikosokey
Thank you for your message and a Happy New Year to you also.
I'm in the process of completing construction of the Goldmund clone. Along with the Roar, we took a first check on Alex / Bigpandas PCB yesterday. We tested with one pair powerfets in each channel. Everything ok so far. I got all powerfets from US today. All twelve in place tomorrow. Then possibly Roar will do some tests. Today I spent my time to prepare the chassis. It will be finished tomorrow. Testing should be done with the PCB mounted in the chassis. I am looking forward to results both to hear and measure in the days to come.
I will take som photos during the building prosess.
Eivind Stillingen
A Happy New Year also to all DiyAudios members. My hope for the year to come that everyone with interests in this Goldmund clone will contribute in a positve way into my (and others) efforts to improve the clone.The war with Nagys is history!! What I Have in my mind is the powering of the input stage. Ostripper I am still waiting on a concrete response to my request in an earlier post.
E.S
Nikosokey
Thank you for your message and a Happy New Year to you also.
I'm in the process of completing construction of the Goldmund clone. Along with the Roar, we took a first check on Alex / Bigpandas PCB yesterday. We tested with one pair powerfets in each channel. Everything ok so far. I got all powerfets from US today. All twelve in place tomorrow. Then possibly Roar will do some tests. Today I spent my time to prepare the chassis. It will be finished tomorrow. Testing should be done with the PCB mounted in the chassis. I am looking forward to results both to hear and measure in the days to come.
I will take som photos during the building prosess.
Eivind Stillingen
A Happy New Year also to all DiyAudios members. My hope for the year to come that everyone with interests in this Goldmund clone will contribute in a positve way into my (and others) efforts to improve the clone.The war with Nagys is history!! What I Have in my mind is the powering of the input stage. Ostripper I am still waiting on a concrete response to my request in an earlier post.
E.S
Liliya , I have a true Full wave tripler (acually - quadrupler) w/ a shunt regulated OP. Link - Full wave Cockcroft-Walton voltage multiplier is the "core" of the unregulated part. This will be followed by a differential based series regulator. I won't "release" it till it's done and powering my main BJT amp's voltage stages (AX).
PS. It will be nice to have a nicely regulated +/ - 90V using a garden variety 25-0-25V trafo. The original goldmund multiplier is a dirty , unsophisticated joke of a multiplier ... To me, not even close to what SHOULD be there. 🙁
For $$1000's of dollars , the cockcroft- walton multiplier(above) is what should be there.
OS
PS. It will be nice to have a nicely regulated +/ - 90V using a garden variety 25-0-25V trafo. The original goldmund multiplier is a dirty , unsophisticated joke of a multiplier ... To me, not even close to what SHOULD be there. 🙁
For $$1000's of dollars , the cockcroft- walton multiplier(above) is what should be there.
OS
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Wow, they look huge. How many channels will be put into each of them?
The relais looks weird. What's wrong with it?
In 1960 I heard my first valve radio and was impressed by the sound.
In 1980 the best amp I ever heard was a class b amplifier.
I was then introduced to class ab and that was the best i had ever heard.
More recently i was introduced to class d and loved the sound that had.
A couple of weeks back a mate let me play my guitar through his valve amp and i was blown away.
Funny how things go in circles !
In 1980 the best amp I ever heard was a class b amplifier.
I was then introduced to class ab and that was the best i had ever heard.
More recently i was introduced to class d and loved the sound that had.
A couple of weeks back a mate let me play my guitar through his valve amp and i was blown away.
Funny how things go in circles !
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wrong direction for T4?
Hi Alex,
Yes, you got me, but I was wondering if you had the transistor in opposite direction. It is a BC556 and you should have it in the reverse direction (only if you are using an alternative for it which has EC reversed as the original, but I seriously doubt that you are not using the original). Pls check.
BTW how are you going to test the protection circuit? Should you test it before you do (I mean soldering) the main amp. ? I found this quite difficult if you had the main amp. in position and simulate any fault. And can you post your procedure of doing that?
BP
Hi Alex,
Yes, you got me, but I was wondering if you had the transistor in opposite direction. It is a BC556 and you should have it in the reverse direction (only if you are using an alternative for it which has EC reversed as the original, but I seriously doubt that you are not using the original). Pls check.
BTW how are you going to test the protection circuit? Should you test it before you do (I mean soldering) the main amp. ? I found this quite difficult if you had the main amp. in position and simulate any fault. And can you post your procedure of doing that?
BP
I took some pictures from the collection process with Goldmund Clone. Roar has been helpful and put his small workshop at his disposal. With the right tools results can bei pretty good. I am very happy so far.
1.Chassiet built around the front plate of the MI 7 from Musical Innovation (Roar Malmin)
1.Chassiet built around the front plate of the MI 7 from Musical Innovation (Roar Malmin)
