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Inspire by Dennis Had Enjoying Vacuum Tube Audio

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  #5541  
Old 02-17-2020, 02:04 PM
FloridaBoy FloridaBoy is offline
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Originally Posted by oldominion View Post
I've been having some pretty severe microphony issues with my 3.1a preamp of late. My assumption was, of course, the tubes. At Dennis's suggestion, I tried some 6dn7 instead of 6sn7; they sounded great in fact, and were cheap. So when I started to get the very fine, pinging and ringing sounds I assumed the cheap 6d's were at fault, so plugged in my trusty old Sylvania 6sn7...only to find that, after a period of warm up, the high pitched pinging and ringing returned.

I also have 6922/6dj8 in my phono stage, another tube that is prone to microphony, but I'm pretty sure I can trace it to the 3.1a preamp.

Has anyone ever experimented with rolling the 6bx7?
I did and did not find one that really stood out. I have the LP27a and used a 6sn7 instead of a 6Bx7. I'm not sure if you can with the LP 3.1a. The pinging and ringing is usually from microphonic tubes. Have you tried silicone dampers?
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  #5542  
Old 02-21-2020, 02:48 PM
zbyte zbyte is offline
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Is the 5R4GY a direct replacement rectifier for the 5AR4 within the same parameters, I wanted to try the KT150 on my inspire amp and Dennis recommends the 5AR4 but was wondering if the 5R4GY could be used with the same effect
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Speakers: Audiokinesis Azel Speakers + Sub Swarm - Amplifier: OTL monos - Pre: 6SN7 preamp - DAC: NOS DAC - Source: Bunch of PC's or Linux based Endpoints running as operating system Audiolinux, Ubuntu, Gentooplayer, Player software: Roon, Squeezelite-R2, mconnect. Upsampling: Sometimes HQPlayer Embedded sometimes resampling through Squeezelite
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  #5543  
Old 02-22-2020, 06:36 AM
FloridaBoy FloridaBoy is offline
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Originally Posted by zbyte View Post
Is the 5R4GY a direct replacement rectifier for the 5AR4 within the same parameters, I wanted to try the KT150 on my inspire amp and Dennis recommends the 5AR4 but was wondering if the 5R4GY could be used with the same effect
The 5R4GY has more voltage drop than a 5AR4.

Tube# - Base - Fvolt - Famp - Vdrop - MaxPmA - MaxPv - notes
5AR4/GZ34-5DA - 5.0 - 1.9 - 17 - 250 - 450 - low Vdrop 5U4/5Y3
5AS4-A - 5T - 5.0 - 3.0 - 50 - 275 - 450 - improved 5U4
5AT4 - 5L - 5.0 - 5.5 - 30 - 800 - 550 - higher power 5U4
5AU4 - 5T - 5.0 - 3.75 - 50 - 325 - 400 - high power 5U4
5AW4 - 5T - 5.0 - 3.7 - 46 - 250 - 450 - long life 5U4
5AX4-GT - 5T - 5.0 - 2.5 - 65 - 175 - 350 - high power 5Y3
5AZ3 - 12BR - 5.0 - 3.0 - 44 - 275 - 600 - compactron 5U4
5AZ4 - 5T* - 5.0 - 2.0 - 60 - 125 - 350 - loctal 5Y3
5BC3 - 9QJ - 5.0 - 3.0 - 53 - 300 - 500 - compactron
5CG4 - 5L - 5.0 - 2.0 - ? - 125 - 400
5DJ4 - 8KS - 5.0 - 3.0 - 44 - 300 - 600 - redesigned 5U4 (higher volts)
5R4-G/GY- 5T - 5.0 - 2.0 - 67 - 250 - 750 - high voltage 5U4
5R4-GYA - 5T - 5.0 - 2.0 - 67 - 250 - 750 - high voltage 5U4 (ruggedized)
5R4-GYB - 5T - 5.0 - 2.0 - 63 - 250 - 900 - high voltage 5U4 (ruggedized)
5T4 - 5T - 5.0 - 2.0 - 45 - 225 - 450 - metal 5U4
5U4-G - 5T - 5.0 - 3.0 - 44 - 225 - 450 - octal 5Z3
5U4-GA - 5T - 5.0 - 3.0 - 44 - 250 - 450
5U4-GB - 5T - 5.0 - 3.0 - 50 - 275 - 450
5V3 - 5T - 5.0 - 3.8 - 47 - 350 - 425 - higher power 5U4
5V3-A - 5T - 5.0 - 3.0 - 42 - 415 - 550 - 5V3 reduced filament current
5V4-G/GA- 5L - 5.0 - 2.0 - 25 - 175 - 375 - octal 83-V
5W4-G/GT- 5T - 5.0 - 1.5 - 45 - 100 - 350 - low power 5Y3
5X4-G - 5Q - 5.0 - 3.0 - 58 - 225 - 450 - 5U4 diff pinout
5X4-GA - 5Q - 5.0 - 3.0 - 47 - 250 - 450
5Y3-G/GT- 5T - 5.0 - 2.0 - 60 - 125 - 350 - octal 80
5Y4-G/GT- 5Q - 5.0 - 2.0 - 60 - 125 - 350 - 5Y3 diff pinout
5Z3 - 5T - 5.0 - 3.0 - 58 - 225 - 450 - 4pin 5U4
5Z4 - 5L - 5.0 - 2.0 - 20 - 125 - 350 - low drop 5Y3
80 - 4C - 5.0 - 2.0 - 60 - 125 - 350 - 4pin 5Y3
82 - 4C - 2.5 - 3.0 - 15 - 115 - 450 - lower power type 83
83 - 4C - 5.0 - 3.0 - 15 - 225 - 450 - 4pin mercury vapour
83-V - 4C - 5.0 - 2.0 - 25 - 175 - 375 - 4pin 5V4
1641 - 8E - 5.0 - 3.0 - 44 - 250 - 450 - rabbit ear 5U4
5931 - 5T - 5.0 - 3.0 - 47 - 300 - 600 - industrial 5U4
6004 - 2AJ - 5.0 - 2.0 - 60 - 120 - 375 - rabbit ear 5Y3
6087 - 5L - 5.0 - 2.0 - 50 - 125 - 350
6106 - 5L - 5.0 - 2.0 - 60 - 125 - 350
6853 - 8HE - 5.0 - 1.7 - 60 - 125 - 350
RK60 - 8E - 5.0 - 3.0 - 44 - 250 - 450 - rabbit ear 5U4
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  #5544  
Old 02-22-2020, 06:39 PM
oldominion oldominion is offline
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Quote:
Originally Posted by FloridaBoy View Post
I did and did not find one that really stood out. I have the LP27a and used a 6sn7 instead of a 6Bx7. I'm not sure if you can with the LP 3.1a. The pinging and ringing is usually from microphonic tubes. Have you tried silicone dampers?
I have always been a cheapskate so I've used rubber washers (which don't melt, I promise!) from the hardware store for ages. But they don't seem to do much with the 6sn7.

Cheap as I am, I may pony up the dough for some Sophia 6sn7's. The Sophia 274 rectifier is magnificent in my Inspire with the T-S KT150's. A highly recommended pairing.
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  #5545  
Old 02-23-2020, 03:36 PM
zbyte zbyte is offline
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Quote:
Originally Posted by FloridaBoy View Post
The 5R4GY has more voltage drop than a 5AR4.
Thank you
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Speakers: Audiokinesis Azel Speakers + Sub Swarm - Amplifier: OTL monos - Pre: 6SN7 preamp - DAC: NOS DAC - Source: Bunch of PC's or Linux based Endpoints running as operating system Audiolinux, Ubuntu, Gentooplayer, Player software: Roon, Squeezelite-R2, mconnect. Upsampling: Sometimes HQPlayer Embedded sometimes resampling through Squeezelite
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