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B1 preamp build thread
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Old 1st May 2018, 12:27 PM   #481
marconi118 is offline marconi118  Germany
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yes this bf862 headamp seems great!
can I omit the input gain stage, as I only need the a buffer?

what is the minimum output load impedance 16 or 8 ohm?
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Old 1st May 2018, 01:12 PM   #482
6L6 is offline 6L6  United States
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B1 preamp build thread
No, you'll need the entire circuit for proper operation.
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Old 2nd May 2018, 12:15 PM   #483
Dennis Hui is offline Dennis Hui  Canada
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B1 preamp build thread
Looks like BF862 is EOL.
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Old 15th May 2018, 01:12 PM   #484
Mixi is offline Mixi  Austria
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The manual says to use 1/4 W RN55D resistors. Thing is that the RN55D only seem to come in 1/8 W. RN65D would be rated at 1/4W. Which ones should i use?

Thanks!
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Old 15th May 2018, 01:48 PM   #485
WalterW is offline WalterW  Netherlands
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B1 preamp build thread
RN55D is 1/8W military spec. It is in real life 1/4W or even 400mW resistor. So you can use those. They are basically the same as CMF55, I always choose the cheapest ones at Mouser, sometimes the CMF55 sometimes the RN55
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Old 16th May 2018, 08:47 AM   #486
Mixi is offline Mixi  Austria
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now the CMF55 seem to be rated at 1/2 watt - although i also saw a spec sheet rating them at 1/4 watt. i guess it's never a problem if a resistor can dissipate more W, right?

me learning a lot about resistors these days :-)

on a different note i found a nice cap for C1. i was looking for a very small can with as much uF as possible as I'm trying to fit this in a rather small enclosure. i think for the size (25mm dia, 30mm height) this one with 12ooo uF is a good fit: Cornell Dubilier 381LX
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Old 16th May 2018, 05:29 PM   #487
Eslheadphone is offline Eslheadphone  United States
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The CMF series are non-magnetic. I use them in most of my builds. The rated power dissapation of resistor will vary depending on the ambient temperature. The data sheet tells the whole story. Depending on the resistance, it is sometimes cheaper to buy the CMF series.
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Old 16th May 2018, 07:48 PM   #488
Eslheadphone is offline Eslheadphone  United States
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The CMF60 can cost Less than the CMF55 . I shop the prices at Digikey and Mouser
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