[time-nuts] FTS 1200 transistor replacement

Traced the problem of my FTS 1200 to the first BC109 Transistor on the A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor low noise is critical. This unit is at least 30 years old and my question is, what transistor will have even lower noise than the than low noise

[time-nuts] iTrax130

Hello, Just got this board from a Chinese ebayer, but unable to find any document about the pin-assignment. Anybody can help... Many thanks and brgds, Ernie. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] time-nuts Digest, Vol 118, Issue 35 Message: 3

Hi, Traced the problem of my FTS 1200 to the first BC109 Transistor on the A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor low noise is critical. This unit is at least 30 years old and my question is, what transistor will have even lower noise than the than

Re: [time-nuts] FTS 1200 transistor replacement

Hi The 2N5089 from ON semi is a pretty good bet for a high beta / audio part. They are $0.37 a piece from Mouser with 11,542 in stock. Bob On May 17, 2014, at 11:37 AM, ewkeh...@aol.com wrote: Traced the problem of my FTS 1200 to the first BC109 Transistor on the A2/A3 AGS/Amplifier

Re: [time-nuts] FTS 1200 transistor replacement

Bert wrote: what transistor will have even lower noise than the than low noise BC 109. Generally speaking, the baseband noise of a bipolar transistor is most strongly influenced by the transistor's base spreading resistance. Of course, the transistor also needs to have whatever other

Re: [time-nuts] FTS 1200 transistor replacement

Thanks for all the help. I do have a couple of BC 109 but I thought with all the work to carefully disassemble the unit that after 30 years there would be a better transistor. Thanks again Bert Kehren In a message dated 5/17/2014 6:47:55 P.M. Eastern Daylight Time, csteinm...@yandex.com

Re: [time-nuts] FTS 1200 transistor replacement

Thanks for all the help. I do have a couple of BC 109 but I thought with all the work to carefully disassemble the unit that after 30 years there would be a better transistor. The fundamentals of solid state physics haven't changed much in 30 years;-) It's a tribute to

[time-nuts] OT - Need a German speaker

Are there any German speakers who live in the USA on this list? I need someone to order me a small kit from a German web site. I'll pay you up front to order this for me. http://www.box73.de/product_info.php?products_id=945 It is a speech compressor kit that plugs into the mic of an FT-817. If

Re: [time-nuts] time-nuts Digest, Vol 118, Issue 35 Message: 3

Ulrich Rohde has a low noise oscillator circuit perhaps it is patented, here is:http://f6csx.free.fr/techni/PLL/Oscillators.pdf 73 Alex On 5/17/2014 9:53 AM, Walter Hofstädtler wrote: Hi, Traced the problem of my FTS 1200 to the first BC109 Transistor on the A2/A3 AGS/Amplifier board.