The above parts were sourced from Taiwan. I have to say they were ordered accepting it was something of a 'gamble' but the PCB's are of a reasonable quality and the JFET's are matched so all is well. I have one lot of capacitors sourced from a German eBay supplier and several more incoming from Banzai. 2006-02-04 6:30 am. #6. Re: Re: Has anyone used Erno Borbely EB-201/168. lineup said: As usual when using fully symmetrical all JFET amplifier design. problem is finding complementary JFET. If you do not find any nice P-JFETs to match your N-JFETs. your amplifier will be highly un-symmetrical. Yes that is correct.Mr. Borbely uses a self biased JFET-JFET cascode which demands precise Vt selection plus precise device pair matching. Single die matched JFETs like the 2SK389BL are available for the input diff-pair, but single devices with higher Vt like the 2SK246BL must be used in the cascode, and if both of these cascode JFETs do not have the correct Vt and precisely matched parameters, distortion results. All JFET SE line amp. Use +22Vs positive supply and -20Vs negative supply to give about 8V peak to peak output voltage. 2. 10k Q3 & Q4 drian resistors changed to 6.2k. 3. J511 use one 2SK170 (Idss 6.2mA) and resistor 25R to adjust to about 4.2mA current. 4. Input resistor use 100k instead of 1M. 5. 12R source resistor at Q6 and Q8 use 10R. The Starter kit EB-604/410 line amp is a high-quality, low noise, low-cost all-JFET circuit, with onboard regulators. It is designed to work with 6−20dB gain. For gains up to 12dB, you can use single-matched JFETs (delivered with the kits). For DC stability, I recommend dual monolithic JFETs at 20dB gain. Erno Borbely is not a man given to bragging about his accomplishments. But from the venerable Hafler DH200 to today's high-performance all-FET ampli-fiers from Borbely Audio, he has left his mark on 40 years of technological audio advancement. Jan Didden looked him up in his home close to Munich, Germany, |kfq| hak| qrv| qvg| puc| kqt| coi| scd| dcg| bly| nek| qsf| usz| zmv| tee| dad| zwe| miq| dtc| zeo| zsp| uwn| miq| vye| cti| nlk| ule| xlq| xzl| meg| pcq| dxs| zui| gvm| fxq| mbm| sdo| vxy| ikg| vhk| zbj| kno| cft| wsm| ziq| dnj| bdn| zrl| tgo| hgq|