Lingwendil, do they usually mention the material from which the socket was made of? Or do you define that just by looking at the picture? I see there are brown and white ones.
kodabmx, thank you for proposal! Do they have pads for screws? I believe that's what I will need to mount sockets.
kodabmx, thank you for proposal! Do they have pads for screws? I believe that's what I will need to mount sockets.
They are like the ones I linked. Chassis mount with solder tabs designed for point to point wiring.
And yes, the white ones are ceramic, and black ones are usually bakelite.
And yes, the white ones are ceramic, and black ones are usually bakelite.
OK, I need two sets (8 sockets) as I'm also going to make my own prototyping boards. They are pretty expensive on eBay:
DIY Kits - 9 Pin Tube Socket Proto Board For Prototyping Breadboard 12AX7 6922 | eBay
If you have sockets for two sets (8 sockets) please drop me the private message with the total price. Thank you!
DIY Kits - 9 Pin Tube Socket Proto Board For Prototyping Breadboard 12AX7 6922 | eBay
If you have sockets for two sets (8 sockets) please drop me the private message with the total price. Thank you!
I like Soviet tube amp parts, but there don't seem to be so many available on eBay as in past years.
One caution about the ceramic Chinese sockets - some of them have smaller round pin holes and on a couple I ran into 'undersize' holes in the ceramic. So be sure to test before you bolt them into a chassis!
Attachments
For the 9 pin mini (Noval) sockets, I suggest you acquire mica loaded phenolic, not ceramic, parts. Mica loaded phenolic has some vibration damping capability.
Is it possible to buy sockets with 'shock absorbers'/flexible mounts like the ones that were so common for preamp tubes in the bygone age?
I think the idea was to reduce microphonic problems in console hi-fi furniture?
Unfortunately I cannot edit my previous post. Here is the new list which includes all proposals except the one about teflon foil capacitor for C2 as what I found is a little bit bulky. Is it possible to find any alternative for C1? I'm afraid that I'll wait too long just for this one capacitor. Thank you!
Code:
T1 - GXSE15-5K
[URL="https://www.edcorusa.com/gxse15-8-5k"]EDCOR - GXSE15-8-5K[/URL]
V1 - 12AX7
[URL="https://www.ebay.com/itm/Sino-12AX7B-Preamp-Vacuum-Tube/152759915406"]Sino 12AX7B Preamp Vacuum Tube | eBay[/URL]
V2 - 6P15P-EV
[URL="https://www.ebay.com/itm/6P15P-EV-4Pcs-Russian-Military-Long-LIFE-Vacuum-Pentode-tube-OTK-same-year-EL83/292276425741"]6P15P-EV 4Pcs Russian Military Long LIFE Vacuum Pentode tube OTK same year EL83 | eBay[/URL]
C1 - 0.082uF 400V
[URL="https://www.ebay.com/itm/Polystyrene-Capacitors-K71-5B-0-082uF-82nF-160V-Diamond-tolerance-5-2pcs/223031743363"]Polystyrene Capacitors K71-5B 0.082uF 82nF 160V ◊(Diamond) tolerance+/-5% 2pcs.+ | eBay[/URL]
C2 - 0.1uF 400V
[URL="https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/716P10454LA3?qs=sGAEpiMZZMv1cc3ydrPrF%252bj%252bsGhgO1VgJsu1Cvqz28U%3d"]716P10454LA3 Cornell Dubilier - CDE | Mouser[/URL]
C3 - 680uF 16V
[URL]https://www.mouser.com/ProductDetail/Nichicon/LKG1E681MESYCK?qs=sGAEpiMZZMtZ1n0r9vR22d%252blFeYd%252bH4EB5OPpYC2i4g%3d[/URL]
C4 - 180pF 1kV
[URL]https://www.mouser.com/ProductDetail/Vishay-Cera-Mite/561R10TCCT18?qs=sGAEpiMZZMt1mVBmZSXTPFXppOBlV6Pk7PmGGS9GNQY%3d[/URL]
R1 - 100 kOhm 0.5W
[URL]https://www.mouser.com/ProductDetail/Xicon/273-100K-RC?qs=sGAEpiMZZMukHu%252bjC5l7YSH9ftMmKdBZT00PQY2CJlc%3d[/URL]
R2 - 100 Ohm 0.5W
[URL]https://www.mouser.com/ProductDetail/TE-Connectivity-Neohm/CBT50J100R?qs=sGAEpiMZZMuDPtTs5Gda2%2fwGMz2hofsMQd4Ntiy7tL8%3d[/URL]
R3 - 820 Ohm 0.5W 1%
[URL]https://www.mouser.com/ProductDetail/Welwyn-Components-TT-Electronics/MFR4-820RFI?qs=sGAEpiMZZMukHu%252bjC5l7YRDwiouGrKBmwSsVuz94HuQ%3d[/URL]
R4 -150 kOhm 2W
[URL]https://www.mouser.com/ProductDetail/Vishay-Dale/CPF2150K00FKE14?qs=sGAEpiMZZMu61qfTUdNhGz34irntT%2fJFIKWZR%2fBAcb0%3d[/URL]
R5 - 100k 5W wirewound
[URL]https://www.mouser.com/ProductDetail/Xicon/280-PRM5-100K-RC?qs=sGAEpiMZZMtbXrIkmrvidHiKlRtT248Uj8xqXsZy2zA%3d[/URL]
R6 - 150 Kohm carbon film 1W
[URL]https://www.mouser.com/ProductDetail/Xicon/294-150K-RC?qs=sGAEpiMZZMu61qfTUdNhG3GWZmU6PwDPWeAE%2fkNyxUU%3d[/URL]
R7 - 220 Kohm carbon film 1W
[URL]https://www.mouser.com/ProductDetail/Xicon/294-220K-RC?qs=%2fha2pyFaduiRHRkVJgnDOB3vlddufLrLIToe7QaFR9Q%3d[/URL]
R8 - 10 kOhm 0.5W
[URL]https://www.mouser.com/ProductDetail/KOA-Speer/MFS1-2DCT52R1002F?qs=sGAEpiMZZMu61qfTUdNhG%2fDQawzJ6c7PUByy9d4vcCE%3d[/URL]
R9 - 470 kOhm 0.5W
[URL]https://www.mouser.com/ProductDetail/Xicon/293-470K-RC?qs=sGAEpiMZZMukHu%252bjC5l7YTF6je7BkLxK9noGLdhjO%252bM%3d[/URL]
R10 - 10 kOhm 0.5W
[URL]https://www.mouser.com/ProductDetail/Kamaya/RC1-2103KTD?qs=sGAEpiMZZMuDPtTs5Gda2zVPfE%252bWF6fk0b2CdrHg4Pk%3d[/URL]
R11 - 150 Ohm 0.5W
[URL]https://www.mouser.com/ProductDetail/Bourns/91A1A-B16-A28L?qs=sGAEpiMZZMtC25l1F4XBU0EalYS803k25mXQbjueSAw%3d[/URL]
R12 - 100 Ohm 0.5W
[URL]https://www.parts-express.com/100-ohm-1-2w-flameproof-resistor-10-pcs--002-100[/URL]
Recommended speakers 3" 8 Ohm 91 dB:
[URL]https://www.parts-express.com/faitalpro-3fe25-3-professional-full-range-woofer-8-ohm--294-1104?AID=1457483&PID=7598510[/URL]I'm not fond of ceramic caps. in coupling positions. However, there's ceramic and there's ceramic. C0G/NP0 is the "best" ceramic and could get you going, until the polystyrene stuff arrives. Check this listing out.
Here is the BoM based on the components in the parts lists.
Power Supply:
$63.83 without resistors, shipping and tax (if any)
Amplifier:
$72.47 - one channel
$72.47 * 2 + $11.95(12AX7) = $156.89 without shipping and tax (if any)
----------------------------------------------------------------------------------------
Total: $63.83 + $156.89 = $220.72 without shipping and tax (if any)
The price also doesn't include sockets.
Power Supply:
$63.83 without resistors, shipping and tax (if any)
Amplifier:
$72.47 - one channel
$72.47 * 2 + $11.95(12AX7) = $156.89 without shipping and tax (if any)
----------------------------------------------------------------------------------------
Total: $63.83 + $156.89 = $220.72 without shipping and tax (if any)
The price also doesn't include sockets.
Last edited:
While waiting for the components I added PWM output to the PeppyMeter. It will allow to use it for the meters based on gas tubes. More details can be found on the wiki page:
PWM VU Meter * project-owner/PeppyMeter.doc Wiki * GitHub
PWM VU Meter * project-owner/PeppyMeter.doc Wiki * GitHub
Just in case you are going to order anything from Edcor. I've just received the response from Edcor where I ordered output transformers:
Your order is in the process. As we stated on our website our lead time is 6 to 8 weeks.
!!!
Your order is in the process. As we stated on our website our lead time is 6 to 8 weeks.
!!!
That's a normal lead time - quite well-covered on the forum - and is usually a conservative estimate. Their stuff is a good value and well worth the wait.
Thank you for another option. The choice was made already. I ordered the components and preparing for another challenge - assembling/tuning.
The components arrived, software release done, so I'm switching back to this project. I've tried to address the comments for the power supply in the following schematic - changed 110V to 120V, renamed T1 to L1, added bleeder resistors R1, R2:
Now I'm trying to get the values for R5, R6. It looks like the current required for the tube heaters is 0.15 (12AX7) + 0.76(6BQ5) = 0.91. Using Ohm's Law we get 12.6/0.91 = 13.8/2 = 6.9 Ohm (12W) for R5, R6 which is a way different from 100 Ohm in this schematic:
https://www.diyaudio.com/forums/att...7189d1546834037-3-5w-tube-amp-dgse-ver2-0-jpg
Another mismatch with the same schematic is B++ voltage. In that schematic it's +255V, in our case it's +150V (same as in 6BQ5 datasheet). Which one is correct?
I've tried to use PSU Designer II to get R3-R4 values but couldn't figure out how can I do that in that program. Here is what I got so far:
I would appreciate any help.
Thank you!
Now I'm trying to get the values for R5, R6. It looks like the current required for the tube heaters is 0.15 (12AX7) + 0.76(6BQ5) = 0.91. Using Ohm's Law we get 12.6/0.91 = 13.8/2 = 6.9 Ohm (12W) for R5, R6 which is a way different from 100 Ohm in this schematic:
https://www.diyaudio.com/forums/att...7189d1546834037-3-5w-tube-amp-dgse-ver2-0-jpg
Another mismatch with the same schematic is B++ voltage. In that schematic it's +255V, in our case it's +150V (same as in 6BQ5 datasheet). Which one is correct?
I've tried to use PSU Designer II to get R3-R4 values but couldn't figure out how can I do that in that program. Here is what I got so far:
I would appreciate any help.
Thank you!
Last edited:
68 μF. for C3., not 68 nF.
1N4007s in the simulations OK, but UF4007s or (even better) Schottkys in the build. The difference in the amount of switching noise generated is huge.
1N4007s in the simulations OK, but UF4007s or (even better) Schottkys in the build. The difference in the amount of switching noise generated is huge.
Got any recommendations for a general purpose Schottky that can be used? Might fix a hum issue I have related to transformer secondary ringing.
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