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August 24th 04, 03:25 AM
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Choosing a FET (2SK19) replacement for 1970s vintage solid stateam/shortwave receiver. Advice Sought
I'd like to replace 3 2SK19 FETs in a 1970s vintage solid state
AM/Shortwave receiver to see if it improves reception and overall performance. When looking around the web for possible replacements or substitutions, I compiled the list below (not sure if they are all compatible, but they look like they should be). Should I try to replace strictly with the same part number or should I try to improve the performance by choosing a "better" FET. I know how a FET works but I am not familiar with the specs listed below each type. For example how does Noise Figure and Gain play into the performance (Sensitivity) of the receiver? I'll take any advice, suggestions or links to sites that can shed more light on this topic... By the way, I didn't want to xpost this message, but if there is a better newsgroup to discuss this on please let me know. Thanks. Regards, Malomarski --------------------------------------------------- 2SK19 Micro Electronics- a fet designed for FM tuner and VHF amplifier applications N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.45-0.65 pF Gain N/A? N/A? MHz --------------------------------------------------- 2SK427 Sanyo - for AM tuner RF amplifiers and low-noise amplifiers featuring ultralow noise figure N-CH J-FET Max Vds 15V Max Id 10mA Max Dissipation 200mW Noise Figure 1.5dB --------------------------------------------------- 2SK161 Toshiba -FM tuner applications featuring low noise figure and extremely low reverse Transfer Capacitance N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.1 pF Gain 18dB 100MHz Noise Figure 2.5dB 100MHz ----------------------------------------------------- 2SK192A Toshiba- FM Tuner applications VHF band amplifier applications N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.65 pF Gain 24dB 100MHz Noise Figure 1.8dB 100MHz |
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#2
August 24th 04, 06:53 PM
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On Mon, 23 Aug 2004 21:25:44 -0400, "O. Alvarez"
wrote: I'd like to replace 3 2SK19 FETs in a 1970s vintage solid state AM/Shortwave receiver to see if it improves reception and overall performance. When looking around the web for possible replacements or substitutions, I compiled the list below (not sure if they are all compatible, but they look like they should be). Should I try to replace strictly with the same part number or should I try to improve the performance by choosing a "better" FET. I know how a FET works but I am not familiar with the specs listed below each type. For example how does Noise Figure and Gain play into the performance (Sensitivity) of the receiver? I'll take any advice, suggestions or links to sites that can shed more light on this topic... By the way, I didn't want to xpost this message, but if there is a better newsgroup to discuss this on please let me know. Thanks. Regards, Malomarski --------------------------------------------------- 2SK19 Micro Electronics- a fet designed for FM tuner and VHF amplifier applications N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.45-0.65 pF Gain N/A? N/A? MHz --------------------------------------------------- 2SK427 Sanyo - for AM tuner RF amplifiers and low-noise amplifiers featuring ultralow noise figure N-CH J-FET Max Vds 15V Max Id 10mA Max Dissipation 200mW Noise Figure 1.5dB --------------------------------------------------- 2SK161 Toshiba -FM tuner applications featuring low noise figure and extremely low reverse Transfer Capacitance N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.1 pF Gain 18dB 100MHz Noise Figure 2.5dB 100MHz ----------------------------------------------------- 2SK192A Toshiba- FM Tuner applications VHF band amplifier applications N-CH J-FET Max Vds 18V Max Id 10mA Max Dissipation 200mW Reverse Transfer Capacitance Crss 0.65 pF Gain 24dB 100MHz Noise Figure 1.8dB 100MHz The lower the noise figure the better, the higher the gain the better, the smaller the Crss the better but all must be for the frequencies of interest of course. The 2SK427 has a low noise figure at 1KHz whereas the 2SK192, 161, and others like the 2SK152 and 544 are rated for 100MHz.. The 2SK19 figures are unknown but probably similar or worse than the 427. You probably won't notice or even be able to measure any difference in an ordinary AM radio but there is no harm in trying. In a good SW the 2SK192 or 544 may just barely make a measurable difference. |
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