The Ford Barn

AL in NY · 01-23-2017, 03:18 PM

I acquired an early Sun EB5 transmitter for my Model A RC2 tachometer. I have wired up a small power supply circuit to replace the internal battery(batteries?). I am replacing all the capacitors inside the transmitter with new ones, but I found only one soldered in battery inside. This transmitter is for a 6 volt/4 cylinder application. Most of the diagrams I have found show two 1.35V mercury batteries. This one looks like it just had one but I have one way to know for sure. Does anyone know if this transmitter uses one or two 1.35V batteries??????

flatheadmurre · 01-23-2017, 03:35 PM

Think they used 1 or 2 batteries in combination with different values of capacitors to suit different numbers of cylinders.

Bob C · 01-23-2017, 04:08 PM

Found this on the HAMB.

skryla said: ↑

I have an EB-5a 6 volts, 4 cylinder. It doesn't seem to have ever had a second battery. Anyone seen one of these? Does this still take a 1.35v or 2.70v?

Yes the 4 and some 6 cylinder transmitters used a single 1.35v battery instead of two.

Automotive Stud, Jul 14, 2014

flatheadmurre · 01-23-2017, 04:17 PM

And the early ones used a single flashlight battery under a small lid.

AL in NY · 01-24-2017, 01:05 PM

Sponsored Links (Register now to hide all advertisements)

Thanks Guys, now I can proceed with the rebuild of the transmitter.

01-23-2017, 03:18 PM	#1
AL in NY Senior Member Join Date: May 2010 Location: Southern Upstate New York Posts: 1,209	Sun EB5 Transmitter I acquired an early Sun EB5 transmitter for my Model A RC2 tachometer. I have wired up a small power supply circuit to replace the internal battery(batteries?). I am replacing all the capacitors inside the transmitter with new ones, but I found only one soldered in battery inside. This transmitter is for a 6 volt/4 cylinder application. Most of the diagrams I have found show two 1.35V mercury batteries. This one looks like it just had one but I have one way to know for sure. Does anyone know if this transmitter uses one or two 1.35V batteries?????? __________________ AL in NY

01-23-2017, 03:35 PM	#2
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: Sun EB5 Transmitter Think they used 1 or 2 batteries in combination with different values of capacitors to suit different numbers of cylinders.

01-23-2017, 04:08 PM	#3
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 9,360	Re: Sun EB5 Transmitter Found this on the HAMB. skryla said: ↑ I have an EB-5a 6 volts, 4 cylinder. It doesn't seem to have ever had a second battery. Anyone seen one of these? Does this still take a 1.35v or 2.70v? Yes the 4 and some 6 cylinder transmitters used a single 1.35v battery instead of two. Automotive Stud, Jul 14, 2014

01-23-2017, 04:17 PM	#4
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: Sun EB5 Transmitter And the early ones used a single flashlight battery under a small lid.

01-24-2017, 01:05 PM	#5
AL in NY Senior Member Join Date: May 2010 Location: Southern Upstate New York Posts: 1,209	Re: Sun EB5 Transmitter Sponsored Links (Register now to hide all advertisements) Thanks Guys, now I can proceed with the rebuild of the transmitter. __________________ AL in NY