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First Tube Project - S5 Electronics Preamp
First Tube Project - S5 Electronics Preamp
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Old 22nd March 2020, 01:37 AM   #11
audiowize is offline audiowize  United States
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A simple improvement would be to use a 6922 instead of the 5670. You'd cut the output impedance roughly in half, which is rather high in this design.

(I would absolutely use a cathode bypass cap)
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Old 22nd March 2020, 02:27 AM   #12
vdi_nenna is offline vdi_nenna  United States
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Thanks audiowse. Will try it.

Do you recommend any specific brand?
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Old 28th March 2020, 12:50 AM   #13
vdi_nenna is offline vdi_nenna  United States
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Question about the cathode resistor capacitor voltage.
I measured 1 volt across the cathode resistor.
Would a 47uF 25v electrolytic be safe or does the voltage across it change with a signal?

I picked up a 60uF MKP 300vac, but it will not fit in the case.
They are 2.25"D x 2"L.

thanks,

Vince
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Old 28th March 2020, 02:00 AM   #14
audiowize is offline audiowize  United States
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There are a ton of really nice audio grade electrolytic caps that would work there that are under $2 each.

If you see 1V DC there, then pretty much any voltage rating is going to work fine.
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Old 28th March 2020, 04:58 PM   #15
vdi_nenna is offline vdi_nenna  United States
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The 6922 filament are not lighting up.
Using the Electro-harmonix gold pin 6922.
Is the 6922 really a direct drop-in replacement for the 5670?
It's ok if it's not. Will send it back.

The 5670 still works, and the bypass caps are not affecting the gain negatively.
There's a bit more midrange clarity.

I'll let this cook for a little bit.
Pretty happy with it as is.

Thanks,

Vince
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Old 28th March 2020, 05:00 PM   #16
audiowize is offline audiowize  United States
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The pinout is not the same between the 5670 and 6922.
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Old 8th April 2020, 02:59 AM   #17
vdi_nenna is offline vdi_nenna  United States
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Now using the Tung-Sol 2C51 in place of the GE JAN 5670.
2C51 costs as much as the kit, but it's worth it.
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Old 31st May 2020, 06:40 PM   #18
JRKO is offline JRKO
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Hows the sound of the tube/F4 combo?

Im interested in something easy to build for a newbie tuber to drive both F4 and MOFO

Cheers
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Old 31st May 2020, 06:48 PM   #19
vdi_nenna is offline vdi_nenna  United States
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It's a fantastic combo.
Replace the 5560 with a 2C51.
The tube costs as much as the kit, but it's worth it.
You might want to upgrade the caps and resistors that come with the kit but that's up to you.

You'll need to build a 200v dc supply and 6.3 heater.

Let us know what you think if you build it.

Thanks
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Old 1st June 2020, 03:24 PM   #20
JRKO is offline JRKO
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Ill let you know how it goes. Might use one of these to provide he voltages required - PS-3 Power Supply Kit

What do you think?
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