TIP: avoiding dried up/blocked ink-jet carts

I heard somewhere recently that Jim Winey is not doing so well. Love his speakers and since i just moved back to MN., I hope to visit the factory again in the near future.

Friend of mine had a p[air of MG-1 (I think A) and they were pretty damn go od. He sold them mainly due to size and the fact that he could make money o n them, he got them for $ 100. The guy he bought them from said they rattle d at high volume, we figured we would have to work on them, I looked it up, there are things to glue etc. on them. But we took them up to about 100 WP C with alot bass and they were fine at that level, and the seller had guess what - bigger pair of Maggies.

In his room they actually sounded better backwards. (Boseapans ? lol) Don't know where the highs were coming from but they came, it the HF driver also bipolar ? I would guess so.

Speaking of planars, I would like to at least hear a pair of Quad ESL-63s. There's something I might buy if I hit tho lotto, not a new car for sure. B ut I don't play because it is a sucker bet.

I had some ideas for electrostatic speakers, could have worked but I found out it had been tried. I guess it wasn't worth the trouble sonically. I was going to take some 6MJ6sw or other horizontal output tubes and run them st acked and bridged to eliminate all the transformers, making it DC coupled. I think I would have had to run them stacked in series (like an Ampzilla) t o get the required voltage. not a cheap undertaking but neither are ESLs in the first place.

Ever see the schematic for the ESL-63s ? Thing has a delay line with severa l taps. It is said that the sound is like it is coming from behind the spea ker, that's probably why.

Some say those Maggies lack bass. I found them not to be "heavy" by any str etch, bit not really lacking. For my use I would have used subwoofers with them, but I am a bass freak.

Some of them weren't all that bad. Chernobyl wasn't bad, and the one at the shop wasn't bad, but then those were not $ 59 specials either. They were B IG.

on the outside & ice in the centre. "

Yup, people think they cook from the inside out but that is an old Husband' s tale. They heat the water in the food.

And there are no power levels, the supposed power levels are just duty cycl e turning the magnetron on and off. (I wonder if it accelerates cathode str ipping) I only saw one microwave with 2 actual power levels and it was anci ent. It actually had an extra tap on the primary of the power transformer t o cut the voltage. I don't remember but I assume it would have to have a se parate filament transformer, but back when they were willing to put more th an ten bucks into a $ 300 item we got things like that.

ch folk. "

I used to wonder what went through some people's mind, but I wonder no more . NOTHING goes through their mind.

I used to flip some cars for extra money. (back when there was such a thing as extra money) So I have this shitcan on the paper. Little Dodge Omni had needed a clutch. The ad said "4-cylinder, 4 door, 4 speed, $ 400. People c al and ask "Do it have a cassette ?".

No, it has a 400 disc changer and a 2,000 watt competition stereo system wi th bluetooth which hasn't even been invented yet, when would you like to co me and test drive it ?

Friend of mine sells a car. Guy calls a few hours later and says "Hey, this car don't run", "Is there gas in it ?". Click.

What happened to the median percentiles ? People either qualify for MENSA o r a Darwin award and not much common sense in between.

But Euro is the bomb !

Look at new cars, want an aftermarket radio ? In the old days it was two nuts in front and a bolt in the back, now you have to cut the HVAC controls off of it, get a kit from Crutchfield and be handy enough to build the damn thing.

White Bear Lake. About a long stone's throw from me. I grew up spending my summers on that lake.

made between say.... 1950 and 1980, and the average American tube radio of the same era.

g wires, springs, tuning mechanisms and speakers.

ral hours.

ut make very sure that there are no interchangeable parts but-for the tubes - and not all of those.

ever can be molded.

rchangeable parts in all, including tubes.

your lists don't represent the euro valve radios I've worked on by any mean s

rtop model that knows the difference between one and three Idaho potatoes w hen asked to bake them, and between 'regular', 'diet' and 'jumbo' popcorn p ackages, without being told. At 1,200 watts, it will cook. The point is not that it has these features, but that having the features is a way of accid ent avoidance. Sure, I know how many minutes each type of popcorn should ta ke, but by hitting a single button, the chances of mis-entry are reduced. A nd so forth.

the job and relies upon it.

and doesn't buy the tool with a great big pile of gimmick features

NT

. There's something I might buy if I hit tho lotto, not a new car for sure. But I don't play because it is a sucker bet.

d out it had been tried. I guess it wasn't worth the trouble sonically. I w as going to take some 6MJ6sw or other horizontal output tubes and run them stacked and bridged to eliminate all the transformers, making it DC coupled . I think I would have had to run them stacked in series (like an Ampzilla) to get the required voltage. not a cheap undertaking but neither are ESLs in the first place.

ral taps. It is said that the sound is like it is coming from behind the sp eaker, that's probably why.

tretch, bit not really lacking. For my use I would have used subwoofers wit h them, but I am a bass freak.

ESL57s are pretty awesome, though I wouldn't say they look good.

Would you really need to stack LOP tubes? Static speakers can be quite simple, they used to get used driven directly IIRC as tweeters in some stuff.

The delay is necessary in the Quads so the treble is a bit more point sourc ed, and you don't get the outer edges cancelling the sound produced by the centre as the latter passes by the former.

NT

he shop wasn't bad, but then those were not $ 59 specials either. They were BIG.

g on the outside & ice in the centre. "

d's tale. They heat the water in the food.

cle turning the magnetron on and off. (I wonder if it accelerates cathode s tripping) I only saw one microwave with 2 actual power levels and it was an cient. It actually had an extra tap on the primary of the power transformer to cut the voltage. I don't remember but I assume it would have to have a separate filament transformer, but back when they were willing to put more than ten bucks into a $ 300 item we got things like that.

The most common way to do reduced power in the early 70s was with an HV cap & HV switch. If you're going to cook a mousse that's the sort you want.

You could reduce both filament & anode (or cathode really), that would work . It's how they used to run bright emitters in the 20s.

NT

I think the max plate voltage of a 6MJ6 is about 5 KV, so it wouldn't quite do it, even bridged, I think.

You mean like a lower value cap for the lower power level ?

What is a "bright emitter" ?

On Wednesday, 25 April 2018 07:58:34 UTC+1, snipped-for-privacy@gmail.com wrote: NT:

Picking the first random ES design I see 475v dc bias.

2nd smaller cap in series with the ac HV feed, shorted for full power.

before dull valve emitters were discovered, valves/tubes used thoriated tungsten direct heated bright emitters. They ran white hot. Nuke magnetrons use thoriated tungsten bright emitters.

NT

These must go back to pre-DeForest days??

I have some direct-heat thorated tungsten 00, 01 and 71A tubes, as well as a number of UV99s and similar. Not a one of them gets much past a mild orange. Not to mention 2A3, 10 and 50s. The closest thing to a "hot" tube I have is a 10, and that filament is about like a 25 watt tube running at 50V or so.

Which tubes are these?

Peter Wieck Melrose Park, PA

ing wires, springs, tuning mechanisms and speakers.

veral hours.

but make very sure that there are no interchangeable parts but-for the tub es - and not all of those.

ans

I have to agree with Peter, but maybe it's just that the only German radios we saw imported were the high end models. Really, the AA5 was so simple, reliable, and performed so well that imports really couldn't compare in a c onsumer driven market.

When I was an early teen, I was given all the tube radios to work on at the family shop, and I always hated the Grundigs, Emuds, Blaupunkts, etc. beca use they were a pain in the ass to work on as opposed to the AA5(6) or FM v ersions of the same. I remember spending a whole afternoon changing out th e piano key switch assy on several. Hated them. They performed well and s ounded fabulous, but that didn't concern the guy on the bench. The good ne ws was that Sams rewrote the schematics to put them in the familiar layout that we were used to on this side of the Atlantic, so that helped.

:

tungsten direct heated bright emitters. They ran white hot. Nuke magnetron s use thoriated tungsten bright emitters.

s a number of UV99s and similar. Not a one of them gets much past a mild or ange.

is a 10, and that filament is about like a 25 watt tube running at 50V or s o.

On further research:

The cathode of a magnetron provides the electrons through which the mechani sm of energy transfer is accomplished. The cathode is located in the center of the anode and is made up of a hollow cylinder of emissive material (mos tly Barium Oxide) surrounding a heater. The feeding wires of the filament m ust center the whole cathode. Any eccentricity between anode and cathode ca n cause serious internal arcing or malfunction.

Does not seem to be much Thorium involved??

According to RCA's RC30 the peak pulse plate voltage it rated 5,000 volts. Without reading all the details this is of course with negative voltage on G1, it is the retrace pulse for the yoke and rectified for HV. So a pair st acked SESAPP would yield 2,000 volts peak at best. Bridged, of course 5,000 volts. I'm fairly sure most ESLs need more than that. Without going to tra nsmitter tubes I think that is about the highest voltage to be had except i n a HV shub regulator such as a 6BK4. Those are good for 27,000 volts but a t 5,000 volts will only pass 750 uA. I think that only works out to about 1

6 watts. Unless ESLs lose a ton of power in the internal transformer that w ill not do. The book doesn't give plate dissipation but the tube s designed with the anode away from the glass and they do get red hot and work just f ine. It is not impossible though, first of all with that topology, triodes should be easier to deal with. It would be a matter of a bunch of them in p arallel which would cost more, but a true audiophile doesn't care.

It doesn't give the maximum heater cathode voltage but I am assuming any de sign will need separate floating filament supplies. Not too hard with moder n SMPS technology. However there is also the issue of frequency response. S ince it is designed for HV shunt regulator use I imagine its frequency resp onse is not stellar. I'm not sure now much can be done with feedback when t here is that much open loop voltage gain. Plus the capacitive load doesn't help.

Makes sense. I red that the power id chiefly determined by the cap value, t he transformers are not all that different, except the one I mentioned that actually had an extra tap for lower power.

In light of that, when I replace the cap in this 1992 Litton, what about us ing a higher value to squeeze a few more watts out of it ? Is that too dang erous or otherwise not feasible ? To me, it is damn hard to have too much power, you just use less time, and since this doesn't ave real power contro l as far as I know, it just cycles anyway. Of course it might already have the biggest value on practice because it is a fairly large unit and I remem ber it had alot of power when it was new. We had to get used to it, it wasn 't like the elcheapos. I would up the cp value for decent results but if it is going to burn something up because of it I'll leave it as designed.

AHA, so that filament is already burning pretty hot then right ? I see.

No, they don't. The emitter is a solid cylinder of Barium Oxide with a (usu ally) copper filament inside it. There are other Barium salts used as well, but no Thorium.

"Bright Emitter" magnetrons are used mostly for industrial heating applicat ions - not hardly in what you have in your kitchen - even an old Amana, or Litton. The cutting-edge of magnetrons is in making more compact and shorte r-wave (high-resolution) radars. Neat stuff going on there.

Peter Wieck Melrose Park, PA

On Wednesday, 25 April 2018 17:21:29 UTC+1, snipped-for-privacy@gmail.com wrote: NT

. Without reading all the details this is of course with negative voltage o n G1, it is the retrace pulse for the yoke and rectified for HV. So a pair stacked SESAPP would yield 2,000 volts peak at best. Bridged, of course 5,0

00 volts. I'm fairly sure most ESLs need more than that. Without going to t ransmitter tubes I think that is about the highest voltage to be had except in a HV shub regulator such as a 6BK4. Those are good for 27,000 volts but at 5,000 volts will only pass 750 uA. I think that only works out to about 16 watts. Unless ESLs lose a ton of power in the internal transformer that will not do. The book doesn't give plate dissipation but the tube s design ed with the anode away from the glass and they do get red hot and work just fine. It is not impossible though, first of all with that topology, triode s should be easier to deal with. It would be a matter of a bunch of them in parallel which would cost more, but a true audiophile doesn't care.

you already know that some ESes run at under 1kV, and the once mildly popul ar ES tweeters ran direct off ordinary audio amp valve anodes. But you can build a megavolter if you want.

design will need separate floating filament supplies. Not too hard with mod ern SMPS technology. However there is also the issue of frequency response. Since it is designed for HV shunt regulator use I imagine its frequency re sponse is not stellar. I'm not sure now much can be done with feedback when there is that much open loop voltage gain. Plus the capacitive load doesn' t help.

"

the transformers are not all that different, except the one I mentioned th at actually had an extra tap for lower power.

using a higher value to squeeze a few more watts out of it ? Is that too da ngerous or otherwise not feasible ? To me, it is damn hard to have too muc h power, you just use less time, and since this doesn't ave real power cont rol as far as I know, it just cycles anyway. Of course it might already hav e the biggest value on practice because it is a fairly large unit and I rem ember it had alot of power when it was new. We had to get used to it, it wa sn't like the elcheapos. I would up the cp value for decent results but if it is going to burn something up because of it I'll leave it as designed.

Nuke magnetrons run red hot. I wouldn't want to heat them even further. I u sed to have a nuke that had its magnetron on show, no cover at all between it & the cooking cavity.

The HV cap doesn't affect filament power of course.

NT

The filaments in the finals in WWII tank transmitters ran white hot. Had an early 20s Crosley radio which didn't have cathodes and the filaments glowed orange. (RCA WD11s)

Used to work on Quad ESL-63s. They sounded great but couldn't be played at high levels. When they arced from being over driven or moisture incursion the damage could be pretty extensive.