No, the ide ribbon cable is legal, it is very short, about two times longer that the factory right angled header pathlength. The rigid header is bad design, owing to fitup tolerances esp heatsinking appropriately pair ic's poweramp
Hi hewo,
These is a massive difference in cross sectional area between the wire and header.
Solder the header after you have the boards mounted, it will be fine then.
-Chris
These is a massive difference in cross sectional area between the wire and header.
Solder the header after you have the boards mounted, it will be fine then.
-Chris
You miunderstand mount of 1875IC's.
It is rigid soldered to upright vertcal pcb secondary substrate.
In turn this secondary pcb is rigid soldered onto mobo, vertically, spce savings intent.
But this weld is by the said right angled header which has your adequacy air gap spacing of one tenth inch clearance between ic legs.
So mobo to secondary pcb ( you call flyboard? ) and ic all must be welded out of chassis, then installed, integrated, back into chassis.
Its impossible to install and weld sequentially, the mobo, then the integrated ic flyboard afterwards, because the iron tip can not solder the flyboard header pins underside which is penetrating to the mobo underside where welding is targetted.
This is why I instituted the ide ribbon, so I could heatsink mount TO220 tab perfect fitup onto designated chassis landing.
Were I to attempt your sequence, extreme accessibility problems would be encountered because of congestion and depth of mobo mounted within chassis recessed foundation.
It is rigid soldered to upright vertcal pcb secondary substrate.
In turn this secondary pcb is rigid soldered onto mobo, vertically, spce savings intent.
But this weld is by the said right angled header which has your adequacy air gap spacing of one tenth inch clearance between ic legs.
So mobo to secondary pcb ( you call flyboard? ) and ic all must be welded out of chassis, then installed, integrated, back into chassis.
Its impossible to install and weld sequentially, the mobo, then the integrated ic flyboard afterwards, because the iron tip can not solder the flyboard header pins underside which is penetrating to the mobo underside where welding is targetted.
This is why I instituted the ide ribbon, so I could heatsink mount TO220 tab perfect fitup onto designated chassis landing.
Were I to attempt your sequence, extreme accessibility problems would be encountered because of congestion and depth of mobo mounted within chassis recessed foundation.
Hi hewo,
Okay, I understand that. The mechanical design was unwise in that case. As long as your wire is heavy enough you should be fine.
-Chris
Okay, I understand that. The mechanical design was unwise in that case. As long as your wire is heavy enough you should be fine.
-Chris
Yup, too tight an area to solder the right angled one tenth inch spacing hard wire header afterwards of main mobo seated mounted, so gotta flexible ide ribbon cable flyboard, and torque TO220 tab heatsinked to structure chassis last, thermal paste mica insulatory easier chking good seating heat transfer.
Pinout ic1875 smart, spanning distances of dc rails away from lowlevel input signals, forgot what oddball pin is other than pair rails, pair inputs invert noninvert
Pinout ic1875 smart, spanning distances of dc rails away from lowlevel input signals, forgot what oddball pin is other than pair rails, pair inputs invert noninvert
Fifth pin ic forgot is spkr, adjacent dc rails pins, so designers of ic smart, keeping large energies afar from pinouts lowlevel in signals
First off, gonna swap 7806 as New existing runs too hot.
Next gotta figure out why one of two newly installed 9.1 zener does not create intended differential.
Then measure dc rails powering 1875's.
Then measure any dc exsistence in 1875's inputs, both, invert, noninvert.
Then measure1875's spkr pin of any dc existence.
Can inject audio signal using ebay china digital multi signal generator at 1875 input coupling cap, but concern is relay inoperability, why?
Currently testing overhauled z28 camaro 69 am radio on bench, all electrolytics replaced, hard to find poweramp TO3 germanium class A replaced, this time, using thermal finning paste delco factory ignored. Also installing dedicated earthing conductors because electrolytics are not remote of mobo but now right onboard mobo (sizes of tantalum are extremely compact in comparison to delco multicapacitor can and delco aluminum caps)
Next gotta figure out why one of two newly installed 9.1 zener does not create intended differential.
Then measure dc rails powering 1875's.
Then measure any dc exsistence in 1875's inputs, both, invert, noninvert.
Then measure1875's spkr pin of any dc existence.
Can inject audio signal using ebay china digital multi signal generator at 1875 input coupling cap, but concern is relay inoperability, why?
Currently testing overhauled z28 camaro 69 am radio on bench, all electrolytics replaced, hard to find poweramp TO3 germanium class A replaced, this time, using thermal finning paste delco factory ignored. Also installing dedicated earthing conductors because electrolytics are not remote of mobo but now right onboard mobo (sizes of tantalum are extremely compact in comparison to delco multicapacitor can and delco aluminum caps)
Hi hewo,
If you use some of those old radios without a speaker load, they will blow the germanium output transistor. Those transistors were mounted directly onto the heat sink, some grease will support microbe growth. Back in those days the "heat sink grease" they used was a clear silicone paste. Easy to miss, and by now may have disappeared.
Your new regulator is running fine. It probably transfers heat to it's tab better than the old one. If it was cool, then I would be worried it was bad. Because it is running hot, you may have excessive current draw.
-Chris
If you use some of those old radios without a speaker load, they will blow the germanium output transistor. Those transistors were mounted directly onto the heat sink, some grease will support microbe growth. Back in those days the "heat sink grease" they used was a clear silicone paste. Easy to miss, and by now may have disappeared.
Your new regulator is running fine. It probably transfers heat to it's tab better than the old one. If it was cool, then I would be worried it was bad. Because it is running hot, you may have excessive current draw.
-Chris
The watchguard fluke dc volt onto dummy 20w radioshack power resistor cold started @ 1vdc, but grew thermally to 4.6vdc so I turned off the dell computer smps feeding yellow and black wires of 12dcv.
The thermal excursion likely resulted by me inserting the antannae plug into the receptacle because I tuned to broadcst and watched acv across radioshack dummyload jump, volume about quarter range.
So I gotta go back to mobo and chk all semiconductors, germanium diodes, small signal germanium transistors, and coupling nonelectro caps passing dc.
I just hope the newly installed Sylvania ecg121 equiv of delco ds-503 isn't ruined, dang.
Fuse diid not blow on mobo.
This radio, of four others, dumped on me by z28 owners, is scarred, rain intrusion, bent depressioned mobo, sticktion mechanicals, ganged potentiometer fouling, pot sw nogo.
But the fact that the fluke vac jumped at quarter volume when antannae inserted means its almost fixed.
Could have melted a voicecoil were radioshack dummyload not attempted, $$$
The thermal excursion likely resulted by me inserting the antannae plug into the receptacle because I tuned to broadcst and watched acv across radioshack dummyload jump, volume about quarter range.
So I gotta go back to mobo and chk all semiconductors, germanium diodes, small signal germanium transistors, and coupling nonelectro caps passing dc.
I just hope the newly installed Sylvania ecg121 equiv of delco ds-503 isn't ruined, dang.
Fuse diid not blow on mobo.
This radio, of four others, dumped on me by z28 owners, is scarred, rain intrusion, bent depressioned mobo, sticktion mechanicals, ganged potentiometer fouling, pot sw nogo.
But the fact that the fluke vac jumped at quarter volume when antannae inserted means its almost fixed.
Could have melted a voicecoil were radioshack dummyload not attempted, $$$
Hi hewo,
ECG & NTE is pure garbage stuff. I know you don't really have much of a choice using them. I used to work at a place where we sold that junk. It was so bad I used to stick the leads out through the bag and test them before removing them from the sales floor. My return rate dropped to almost nothing after I started doing that.
-Chris
ECG & NTE is pure garbage stuff. I know you don't really have much of a choice using them. I used to work at a place where we sold that junk. It was so bad I used to stick the leads out through the bag and test them before removing them from the sales floor. My return rate dropped to almost nothing after I started doing that.
-Chris
I test out of ckt b&k transistor tester, features beta gain, leakage, frequency, transconductance, and pinout identification
These sylvania ecg stamped Korea 74 yr, gotta extract and test if blown, also gotta test what's inputted on its base, live
These sylvania ecg stamped Korea 74 yr, gotta extract and test if blown, also gotta test what's inputted on its base, live
They (ECG Ge transistors) tended to be very high in leakage. Over what was normal for Germanium transistors. Si product had low gains, some leaky. Just general garbage, plus a high failure rate if that wasn't enough.
Measure 17dc only plus rail 1875 both, measure 6dc 6n3 htr only one tube so htr unalive one tube, gotta confirm traces feed dual rail to 1875 ic since other rail mv reading wrt earth, and one of 2 9.1zener none differential
leaky new ecg121
yup, brand new ecg121 plus sylvania 1970's ecg121 spares new unused all test leaky on b&k tester, dang, loss ebay monies, reattemptting new purchase, alas, the shortfalls of procuring parts as a repairist!
i am wondering if the owners after market new antannae is making the signal just too big, because the previous (of four) same radio replaced with same ecg121 worked flawlessly using the genuine old dilapidated z28 1969 camaro antannae at my workbench. maybe the old antannae prevents ruin?
yup, brand new ecg121 plus sylvania 1970's ecg121 spares new unused all test leaky on b&k tester, dang, loss ebay monies, reattemptting new purchase, alas, the shortfalls of procuring parts as a repairist!
i am wondering if the owners after market new antannae is making the signal just too big, because the previous (of four) same radio replaced with same ecg121 worked flawlessly using the genuine old dilapidated z28 1969 camaro antannae at my workbench. maybe the old antannae prevents ruin?
Hi hewo,
Keep in mind that germanium transistors are leaky compared to silicon types. Also the E-B voltage drop with silicon is much higher too. You can't do a direct substitution Si for Ge, in case you were wondering. The big joke is that ECG121MP were supposed to be matched pairs. What on earth is an "ECG121 plus"?
You might have better luck using a transistor with real part numbers.
-Chris
The antenna would not have any affect unless you turn the set way up 'cause it sounds better on FM.
Keep in mind that germanium transistors are leaky compared to silicon types. Also the E-B voltage drop with silicon is much higher too. You can't do a direct substitution Si for Ge, in case you were wondering. The big joke is that ECG121MP were supposed to be matched pairs. What on earth is an "ECG121 plus"?
You might have better luck using a transistor with real part numbers.
-Chris
The antenna would not have any affect unless you turn the set way up 'cause it sounds better on FM.
This radio design has infamous leakage and death of the germanium power amp.
Maturity of the mat'ls, construct, and longevity, was not at par.
That's why it keeps failing.
What I don't understand is the first radio runs flawlessly using sylvania ecg121, but the next radio faults after antennae is connected demanding poweramp servicing. Had no antenna been connected, the burnin would likely never reveal germanium fault failure by internal leakage and runaway destruct.
The original germanium from Detroit tests gross leakage on the b&k tester, 13.8vdc applied, meter reads offscale over 5ma.
New ecg121 under same leakage test is 1 to 2 ma.
The first successful radio with ecg121 had zero leakage regardless of applied voltage.
This indicates I got lucky buying that one, and not lucky buying the remainder five.
The original germanium is called delco ds-503.
I suppose it just depends who made these germanium, whether tokyo, mexico, etc., back in the 60's era
Maturity of the mat'ls, construct, and longevity, was not at par.
That's why it keeps failing.
What I don't understand is the first radio runs flawlessly using sylvania ecg121, but the next radio faults after antennae is connected demanding poweramp servicing. Had no antenna been connected, the burnin would likely never reveal germanium fault failure by internal leakage and runaway destruct.
The original germanium from Detroit tests gross leakage on the b&k tester, 13.8vdc applied, meter reads offscale over 5ma.
New ecg121 under same leakage test is 1 to 2 ma.
The first successful radio with ecg121 had zero leakage regardless of applied voltage.
This indicates I got lucky buying that one, and not lucky buying the remainder five.
The original germanium is called delco ds-503.
I suppose it just depends who made these germanium, whether tokyo, mexico, etc., back in the 60's era
Hi hewo,
Sadly - yes. ECG got a reputation for selling re-branded floor sweepings. I have serious thoughts that they did buy rejected material. They may have been told the stuff was "good enough". My long association with a store that sold brand new ECG parts (worked there) pretty much proves that point to me. I used to poke the leads through the bag and test the parts before using them for service in the back. Guess what? Most were "not great", but maybe good enough to last 90 days. Once I started using real parts, my service return rate dropped to very close to zero. That proved my point to the store manager.
Maybe you should try and find some scrap radios of the era for parts. Its the only way you'll get real parts I think. Scrap yards and flea markets. Never power one up without a speaker though (car radios).
-Chris
Sadly - yes. ECG got a reputation for selling re-branded floor sweepings. I have serious thoughts that they did buy rejected material. They may have been told the stuff was "good enough". My long association with a store that sold brand new ECG parts (worked there) pretty much proves that point to me. I used to poke the leads through the bag and test the parts before using them for service in the back. Guess what? Most were "not great", but maybe good enough to last 90 days. Once I started using real parts, my service return rate dropped to very close to zero. That proved my point to the store manager.
Maybe you should try and find some scrap radios of the era for parts. Its the only way you'll get real parts I think. Scrap yards and flea markets. Never power one up without a speaker though (car radios).
-Chris
trying the orig delco radio ds-503 old (but new) stock
and another general electric sk3009
wondering if germ deteriorates just sitting new unused over time fifty years
i asked camaro owner bring back fifty year old camaro antenna, has poor splice in coax, maybe it wont blow the germanium? owner wants splice made perfect invisible, can do? how?
and another general electric sk3009
wondering if germ deteriorates just sitting new unused over time fifty years
i asked camaro owner bring back fifty year old camaro antenna, has poor splice in coax, maybe it wont blow the germanium? owner wants splice made perfect invisible, can do? how?
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