Jump to content

Another One Bites The Dust: SDS-DOA


Voltron

Recommended Posts

OK, so a picture of the insides of guzziguys amp would help. Reason is that

the one of the two companies probably used has different wiring colors on the

transformer wires. Pictures of the area around the transformer. Also looking for

transformer wires not used (like the 5v ct winding on the hammonds)

I'm working with someone that is trying to fix tyson's amplifier right now.

You betcha, mikhail fail all over the place. The B+ on that thing with

6bl7's is 500 volts. At 30ma. Into a 25 ohm load it puts out only 2.5 milliwatts

before clipping. By the way, on that unit the output caps are running 50 volts

over spec.

On voltron's amp the spec on the output caps is 160 volts (pretty sure on this

one) which means he should never EVER go more than 2 x 75 volt gas tubes

(well 4 total). I'm pretty serious about this one. Otherwise the posibility of

expensive headphones going poof...

Link to comment
Share on other sites

  • Replies 264
  • Created
  • Last Reply

Top Posters In This Topic

On voltron's amp the spec on the output caps is 160 volts (pretty sure on this

one) which means he should never EVER go more than 2 x 75 volt gas tubes

(well 4 total). I'm pretty serious about this one. Otherwise the posibility of

expensive headphones going poof...

that's no problem, i know someone in the business of fixing R10s

Link to comment
Share on other sites

OK, so a picture of the insides of guzziguys amp would help. Reason is that

the one of the two companies probably used has different wiring colors on the

transformer wires. Pictures of the area around the transformer. Also looking for

transformer wires not used (like the 5v ct winding on the hammonds)

Ken shot some internal pics of his amp for me which I'm sure he'll share as soon as he sees this.

Also, I've found a second stock Extreme and when I asked the owner if he'd mind taking internal shots so we could see if it was the same primary-as-secondary nonsense he said he couldn't. All of the screws are so tight that the hex heads strip before they move. I offered to open it for him and explained why, he decided to retire the amp instead. :( What a shitty second half of 2009 SP owners have to look forward to.

Link to comment
Share on other sites

You just think that it is a plitron transformer because you have been told it is.

Given the events of the recent couple of months, how do you really know unless

you pop the cover and look. plitron transformers, every one i have ever seen going

way back are all toroids and won't fit into the square box. So if you still have

the 4 inch x 4 inch square box there is no way a plitron toroid is going to fit in there.

If you have the round cover then there is a good chance you really have the

right transformer. Then there is the issue of what particular model number it is.

Here is a big hint. Nothing mikhail has ever done that i have seen so far has custom

transformers, everything is a stock model. His line that he had the transformers custom

made is pure bullshit.

If the transformer runs so hot that you can't touch it after it has been on for an hour,

it is likely that sooner or later the transformer will let go.

When that happens a custom transformer is about $107. But then it ends up looking

like mine does now instead of what it used to look like.

I'll check the temperature tonight. With the Platinum Extremes, there is no 4"x4" box. Instead, there is a round transformer cover (probably part of the transformer itself) that has a height of 3.5" and a diameter of 6".

You've actually seen pictures of the internals before as I've posted them here. However, here they are again:

http://s128.photobucket.com/albums/p197/kmueller13/P1010169.jpg

http://i128.photobucket.com/albums/p197/kmueller13/P1010171.jpg

http://i128.photobucket.com/albums/p197/kmueller13/P1010172.jpg

http://i128.photobucket.com/albums/p197/kmueller13/P1010174.jpg

http://i128.photobucket.com/albums/p197/kmueller13/P1010176.jpg

http://i128.photobucket.com/albums/p197/kmueller13/P1010178.jpg

The issue with D5 is known. I'm hoping that it's due to me running 6528 tubes for a short period of time. It hasn't gotten any worse since I stopped. Of course, Mikhail ok'ed running those tubes for up to 3 hours at a time. :palm: D5 will be replaced soon.

Edit: Oh yeah, while I can't see much of the transformer including a model number, I can see that Plitron's web addy on it.

Edited by guzziguy
Link to comment
Share on other sites

If the transformer runs so hot that you can't touch it after it has been on for an hour,

it is likely that sooner or later the transformer will let go.

I just had the amp idling (i.e. no music) for 1 hour. The transformer cover is absolutely cool to the touch. Do I need to redo the test with music playing?

Link to comment
Share on other sites

Well it looks like you are ok as you have the real thing. Maybe even custom.

So you are fine although at some point you have to deal with the overheated

resistor.

As far as voltron and tyson, it turns out mikhail had it exactly backwards. For

low impedance loads you want more current, not more voltage. Trouble with most

and probably all of those is the 500 volt power supply rail. By the time you turn

up the current on the output tubes for maximum power and linearity the regulator

device is dishing out 30 watts. (60 watts in voltron's case)

And clearly without any kind of heatsink that big, things are going to get very

warm very fast.

Edited by kevin gilmore
Link to comment
Share on other sites

You ever see a singlepower product leave the factory with heatsinks???

And not the ones that one guy put on his pencil amplifier to keep it from

getting so hot it was able to boil water.

60 watts of heatsink is twice what you put on a dynahi

No fear, i've found a cheap transformer that fixes most of that problem.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.