OH yeah I forgot the standard warning: "Empty mouth of food like substances before reading" Sorry, just add that warning from now on to anything I have to say. I dated a semi-hot chick in High School
It doesn't matter if it is tuned choke or regular choke Gary. Without a heavy bleeder the choke acts like a hunk of wire and the cap charges to cap input filter voltages. I have 100K ohms on the supp
Ah, take it easy on him Keith, we were all kids at one point and have stupid tails to tell. Two guys I know are missing an arm from their experiences. I just have this weird tick... Tick... Tick... f
Where is this choke you are talking about used? If it is the cathode choke... it is 15uH not mH. When I build my 8877 amps, I use an off the wall Radio Shack part for the cathode choke. They have a 1
Yeah, ALPHA did it on the Alpha 77 in 1977... They used a 50V bucking winding in the main power transformer running the blower at 75V and as the thing loaded down the voltage would drop speeding up t
Send to machinist for a surface job. Don't mess around. BOB DD 2 There is no substitute for getting both pieces machined flat and finished with a low roughness surface. If they don't 'suck' like slip
Yes that is correct, after a year or so of abuse on here? Lou and I met in person at Dayton and I drank his beer. (Along with two of my NAQRO Club entourage.) Semper Amplio! It was a very jovial meet
Are you serious VAN? That original RS store in Boston and the RS "Name" are nowhere near the same entity. OH OH, yeah and I shopped at the ALLIED RADIO STORE in the Minneapolis area too back when, th
I totally agree, the heat spreaders need to be a pancake and copper usually is unless somebody bent it. The heat sink should be flat as this one in question is obviously warped. The copper edges can
Roger, Extra transfer fees? The key clue is to look at the feedbacks. If he has less than 98% I'd run like crazy. I would look at what people actually say in the feedbacks and what the seller says ab
WOW, Water cooling. On a 4 MRF-154 amp you would have the Mister Coffee Attachment. OVER There's always water cooling - solder some tubes onto the underside of the heat spreader (before you do the fi
Carl, I have a pair of Y-739F's They are Planar triodes with 600 Watts of plate dissipation. Basically giant 3cx100's or 3c39's They are used in aircraft pulse applications. I was thinking, they woul
Instead of doing an air copper sink, go water cooling. I do agree with everything you stated about cost, weight and thermal qualities. I don't agree so much with soldering, but you need to with water
The part is still available from HENRY RADIO and he has them in stock last I checked. Email Ted and he'll fire one right out to you. henryradio@earthlink.net The last price I had for the unit was...
I donno Steve, Why not buy Bill's 3KA and modify a new one? That old 3K was an antique. Plus the guy who put the 8877 in it was of questionable integrity. BWAAHAHAHAHAHAHA. BOB DD This is a long shot
Dude, is an air-pipe better than a water-pipe? The stock Alpha 77 diodes are good to almost any reasonable power level. I ran my first power conversion to 5KW out with them without failure. As far as
No do not increase the bleeder resistor values, that would allow the "choke input" voltage of .9 times the supply voltage to climb to 1.4 times the voltage acting like a "Cap input PS" and possibly d
When I worked for Electronic Center (ECI) in MSP during my college undergrad years circa 1978-79-80 ish We were a fairly large Eimac dealer. That is as Eimac dealers went in those days. I've mentione
Oh my goodness here we go again discussing how to put a plug on a ham amplifier. After having worked in the past as a professional electrician not a ham wiring his own rig I have found: 240V circuits
Yes Gary, they revamp that code every few years... Things like Arc Fault breakers and crap like that. Before Carl goes out and looks at his stove or dryer and comes back and tells you that they only