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First Power-up in 55 Years - Need Advice

Kasanay said:
Ok, I have dummy loads (32 ohm each). Could you please explain "check for offset"?
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Quite simple really. Just measure across the output terminals to determine if,and how much,DC voltage is appearing. The best is obviously 0 volts,but is not always achievable,even with solid state gear. Not knowing these units,I really couldn't give you an exact value,or if they even have adjustments for this.

I'm guessing you live somewhere with a cool climate and very reasonable electric rates?:rolleyes:
 
Kasanay said:
I'd be intrested i reading anything about the company. If you have the link to the other system, I'd love the to check it out.
I already own an MP Engineering system that is missing the power amps. This will make the system complete.

View attachment 706424
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"I'll be in my bunk!"

:eek2:
I found the link when I searched OTL amps under the company name. There was very little detail on it.
 
you might find some info on these if you contact the gent behind the preservationsound http://www.preservationsound.com/?cat=17 site - he seems very knowledgeable on Ct. audio history...

wicked cool amps, in a mega-heat kind of way.

This may inspire me to finally dig into the H3 Futterman I have somewhere......Happy testing!
 
x3workshop said:
Destroying tubes by pulling them and testing them? That makes no sense. Can you explain that logic?
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Any handling and especially making mistakes with an tubetester has destroyed more then one tube. It's
very annoying since the tubetester exersice don't make any difference, if the tube worked when
the amp was turned off, it will work the next time it's turned on again.
And if the amp fail to work as expected, soem measurment inside the amp tells more then
any tubetester.
To summarize : don't mess around with something that probebly works. And if it don't work
a normal fault identification procedure is in order, not a total disassemble and random test
 
peterh said:
Any handling and especially making mistakes with an tubetester has destroyed more then one tube. It's very annoying since the tubetester exersice don't make any difference, if the tube worked when the amp was turned off, it will work the next time it's turned on again.
And if the amp fail to work as expected, soem measurment inside the amp tells more then
any tubetester.
To summarize : don't mess around with something that probebly works. And if it don't work
a normal fault identification procedure is in order, not a total disassemble and random test
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Fascinating.

200_s.gif
 
I rarely test tubes either. Rarely does the tester tell me things that I don't find in other ways, and more than once its told me I had lemons but the amplifier made quite pleasing lemonade from it.
 
So here's another question: I'll need to transport these about a thousand miles.
I may decide to ship them UPS ground, carry them on the plane or drive then home.
I don't think I'll be able to carry all 4 chassis on the plane, so I may ship 2 and carry 2.
Should I pull the tubes before shipping?
 
Kasanay said:
I'd be intrested i reading anything about the company. If you have the link to the other system, I'd love the to check it out.
I already own an MP Engineering system that is missing the power amps. This will make the system complete.

View attachment 706424
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I remember when you picked those up. The remote, separate power supplies, etc. Impressive

Looks like you'll be the go to for MP audio gear :thumbsup:
 
Kasanay, I would fly in to pick em up, rent a van, and drive all of them home...or rent a van from Detroit and make a round trip...or hire Steve to do it, door to door. I would not have these shipped in any manner otherwise. I have Steve's phone # if you need it, he likes these trips.

I would test all of the tubes before startup, do a visual inspection with a tech, and put them on both a variac and a current sentinel. Current draw will be the first indicator you have a problem with these, while a variac is a voltage slave. You need both with these amps.

I have talked with Ken about bird dogging for such a pair for you, but it looks like you were already successful. Congrats, and good luck!
 
I really hope the amps turn out to be plug and play for you. Very nice pick-up. Ya , I would do the van too.
 
If you are packaging them for shipment, I'd pull the tubes and package them separately. If done right, you should be able to have these shipped with no troubles, but that would involve each amp being packed separately, probably double boxed with lots of foam, etc. Then all of the tubes will need to be sent in their own box, though I don't really see any reason they couldn't all go in one package if they are wrapped individually and all that. Just pretend you are shipping eggs inside a box of hammers and thats pretty much what you'd have to prepare for.
 
sheltie dave said:
Kasanay, I would fly in to pick em up, rent a van, and drive all of them home...or rent a van from Detroit and make a round trip...or hire Steve to do it, door to door. I would not have these shipped in any manner otherwise. I have Steve's phone # if you need it, he likes these trips.

I would test all of the tubes before startup, do a visual inspection with a tech, and put them on both a variac and a current sentinel. Current draw will be the first indicator you have a problem with these, while a variac is a voltage slave. You need both with these amps.

I have talked with Ken about bird dogging for such a pair for you, but it looks like you were already successful. Congrats, and good luck!
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Dave,

Somehow you misunderstood the logistics. Detroit is not in any of the plans. I am not in Detroit and the seller is on the east coast. The other gear that I purchased this past December, came from near Detroit. There is no connection between the first purc
I am now leaning toward making the drive (both ways). It is the safest & least expensive but also, the least convenient.
Thanks for keeping lookout for these.
 
wonder if they could be padded and crated and then blanket wrapped UShipped with White Glove treatment? Single shipper and essentially door to door.
 
Kasanay said:
View attachment 706408
I have posted a photo (try to not soil yourself) the model that I am negotiating. I do not have any photos of the actual items. These do have isolation transformers. In fact, each amp has a power supply on a separate chassis.
One thing that I am concerned about is the time-delay relay. Apparently, the filaments are given a good amount of warm-up time before the B+ comes on. I thinking that even with a variac, the plates will be hit hard with power when the relay closes. Not sure how to prepare for that.
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Is that all?
 
Remove tubes. Build a wood crate from plywood mounted on a skid (pallet).
Bolt them to the through the bottom, cover with plastic film or a trash bag and fill the crate with expanding foam.
Unpacking will be a royal pain but they just might survive UPS.
 
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