Has anyone put in a new TI board?

[Clem Z.]

the TI "box" used germanium PNP transistors

which were not much good in hot conditions.i put the originals on a transistor curve tracer scope and then found ones with the same wave form. the 632 was a PNP 100v gain 20,584 was PNP 25v gain 400 and the 643 was a PNP 70v gain 200. the power trasistor,632,could be replaced with a sylvania ECG 179,the drive transistor,584,could be replaced with a RCA SK 3014,silvania EGC121 or a motorola HEPG6005 and the trigger transistor,643,
could be replaced with a RCA SK3004 or a sylvania ECG102A.the diode,642,could be replaced with a RCA SK3099 or a sylvania ECG151A. this was back in the 70s and these were 1/2 the price of the GM parts. when these parts became impossible to get i quit rebuilding the amp. if you wanted to see what was in the new potted units i would think soaking it in MEK would dissolve the epoxy they use

[Michael H.]

Re: the TI "box" used germanium PNP transistors

Clem,

Thanks but... the only parts that I understood were the first and last few sentences. The middle part was a foreign language to me. My electronics knowledge level is near zero.

[Clem Z.]

my knowledge is limited to what i had to know

i have no degree in electronics but i knew good sharp people who did.

[Terry M.]

my knowledge is limited

Someone once told me that one need not know everything -- to know where to find the information is good enough.

[Clem Z.]

albert einstein said that never worry about

memorizing the facts just know where to look them up,or something to that effect

[mike valliant]

Re: I talked to Dave today and ordered the board

Ran into a hard start problem also with the
new style board.Engine would crank but not
fire until the key was released.Something about
a miss match between the board and the distributor.
Rebuilt original cured the problem and works great.

[Michael B.]

Re: I talked to Dave today and ordered the board

This is exactly what happened to me. Dave said it was a weak signal from the magnetic pickup coil. He said the solid state units were sensitive to that. I went back with the stock board and replaced the pickup coil. When I swapped it out it occured to me that the green stripped lead may not have been in the plug correctly. The instructions with the new pickup was specific as to where the green striped wire should go. I always wondered if that might have been the problem.

[Mark #28455]

backwards leads from pickup

I have been running the MSD ignition amp with the original Mag Pulse pickup coils since the early 80's. If you get the Mag Pulse pickup leads backwards, the engine will run, but the timing will be unstable and jump around by 10 to 20 degrees as you bring up the RPM. I am unsure of how the stock amplifier is affected by reversing the leads.
Mark

[Clem Z.]

Re: backwards leads from pickup

the same thing happens when reversing the leads when using the stock amp.been there done that