# \#4710 safety valve
**URL:** https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789
**Category:** KOSMO MODULES
**Created:** [January 26, 2021, 11:52am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789 "2021-01-26T11:52:21Z")
**Posts on this page:** 20
**Page:** 7
### Author:  [@Ben](https://lookmumnocomputer.discourse.group/u/Ben)
#### Post date: [April 10, 2021, 8:24pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/122 "2021-04-10T20:24:34Z")
That totally explains me getting almost nothing out with the PO-35! š¤Æ
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### Author:  [@Mezzanine](https://lookmumnocomputer.discourse.group/u/Mezzanine)
#### Post date: [April 12, 2021, 9:32pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/123 "2021-04-12T21:32:15Z")
Well after multiple build headaches, Iām throwing up my arms too. First time I āfinishedā building, no sound AND the LED never lit up. Checked everything then out of curiosity I flipped the chip TL072 around and the LED lit up but still no sound. Signal passes through it just fine when bypassed. Flip it on, no sound, let the tube warm up, still cool to the touch. I guess Iāll try to check the solder on the tube again.
Been reading all the comments but I wish I at least had some signal instead of low volume, ha!
Cheers, guys!
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### Author:  [@Mezzanine](https://lookmumnocomputer.discourse.group/u/Mezzanine)
#### Post date: [April 12, 2021, 11:08pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/124 "2021-04-12T23:08:21Z")
UPDATE: Resoldered the tube. Heats up now! Still no signal ā¹
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### Author:  [@devicex](https://lookmumnocomputer.discourse.group/u/devicex)
#### Post date: [April 13, 2021, 12:08am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/125 "2021-04-13T00:08:16Z")
seems like soldering of the tube is a recurring problem . maybe use of socket would be better ?
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### Author:  [@CyroS](https://lookmumnocomputer.discourse.group/u/CyroS)
#### Post date: [April 13, 2021, 8:06am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/126 "2021-04-13T08:06:20Z")
Thatās my exact issue, Iām beginning to wonder if I bust the tube by soldering it. I checked it with a scope and Iām getting nothing on the output pin so itās looking highly likely, going to order a replacement tube and perform the fun task of desoldering!
Might also grab a tube socket and see if thereās enough clearance to fit one in there.
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### Author:  [@lookmumnocomputer](https://lookmumnocomputer.discourse.group/u/lookmumnocomputer)
#### Post date: [April 13, 2021, 8:48am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/127 "2021-04-13T08:48:04Z")
the legs to check are the ones going to ground they are always the ones that are a little tough.
soldering the tube down itll take a lot to break it in all honesty. the reasons for soldering
the eurorack safety valves off spurts from the GMSN one that was done after my youtube video were all soldered directly to the board it proved successful to do this, they were a lot more reliable than the socket ones I had which always had a tendency of shaking loose and not working after a number of shows. have valves pointing forwards and also visible (which is a must haha) meant they would be shakey, and also another one I took out and put back in valves all the time which wore out the sockets.
-for the amount of time tubes last (this will likely last longer than you and me as they are not being operated at full operating temperature) it just makes sense to solder them in. they dont need replacing so removing a socket seems a smart thing to do
-socket adds more height to the module ie more chance of knocking it and smashing it.
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### Author:  [@lookmumnocomputer](https://lookmumnocomputer.discourse.group/u/lookmumnocomputer)
#### Post date: [April 13, 2021, 8:48am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/128 "2021-04-13T08:48:32Z")
could you send a pick perchance of the back of the board??
also can you see from underneath the tube there is definitely no shorts with the LED pads?
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### Author:  [@lookmumnocomputer](https://lookmumnocomputer.discourse.group/u/lookmumnocomputer)
#### Post date: [April 13, 2021, 8:51am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/129 "2021-04-13T08:51:27Z")
however I know its a source of controversy. so im trying to find things like linked [Socket Pins \*84 pcs\* for 6 x IN-14 Nixie Tubes IN-8-2 IN-16 IN-19 for Clock 788144766074 | eBay](https://www.ebay.com/itm/Socket-Pins-84-pcs-for-6-x-IN-14-Nixie-Tubes-IN-8-2-IN-16-IN-19-for-Clock-/183575333910)
the right size for 12ax7ās. that can potentially be soldered from the back of the module even. that way if people are not feeling confident, and also dont need to worry about the ruggedness of the synth as its staying in one place and hardly ever moves or gets chucked in a van then maybe its a good option
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### Author:  [@lookmumnocomputer](https://lookmumnocomputer.discourse.group/u/lookmumnocomputer)
#### Post date: [April 13, 2021, 8:54am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/130 "2021-04-13T08:54:37Z")
ok I have found these.
> **[2x gold plated 9pin bakelite tube socket testing saver for 12AX7 ECC83 5670...](https://www.ebay.co.uk/itm/303939357353?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=303939357353&targetid=885285326120&device=c&mktype=pla&googleloc=1007006&poi=&campaignid=10219897599&mkgroupid=103415893353&rlsatarget=pla-885285326120&abcId=1063846&merchantid=232719203&gclid=Cj0KCQjwgtWDBhDZARIsADEKwgNkYzCPTDEdow9rx6v2GDoGayF2M_qI9XuDSz9Ed33zugBk_6aBOKAaAtisEALw_wcB)**
>
> 2pcs 9Pin Tube Socket Testing Saver. Gold Plated Pin. Attach To:6DJ8 EL84 6922 6BM8 6BQ5/EL84 6CG7/6FQ7 6DJ8/ECC88 6DL4 6EU7 6AU8 12AT7/ECC81 12AU7/ECC82 12AX7/ECC83 12AY7 12AZ7 12BH7 12BY7 5751 5814 6189 7119/E182CC 7199 E80CC EF86,etc.
these share the same footprint as the valves. if anyone finds local links to their country please shareĀ±! I have ordered some to try out. it looks like this will bring the height of the tube to the bottom in line with the panel. near enough the same height as a DIY one. so it might be a good option!
im not going to include this on the webpage until mine arrive and I have tested
also found these but a lot more money lol [EIZZ High End Miniature 9pin Tube Sockets Bases For 12AX7 6922 EL84 ECC82 ECC81 | eBay](https://www.ebay.co.uk/itm/EIZZ-High-End-Miniature-9pin-Tube-Sockets-Bases-For-12AX7-6922-EL84-ECC82-ECC81/323958714666?_trkparms=aid%3D555023%26algo%3DHOMESPLICE.SIMRVI%26ao%3D1%26asc%3D20210125104017%26meid%3D0ae554c0f9f048e4ab5344aa002a149e%26pid%3D100752%26rk%3D14%26rkt%3D20%26mehot%3Dag%26sd%3D303939357353%26itm%3D323958714666%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5hPointwiseWebNoToraCoCoViewsNoHighIdfOrRoundRobinBlenderWithPromotedViewItems&_trksid=p2047675.c100752.m1982)
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### Author:  [@KardashevTypeII](https://lookmumnocomputer.discourse.group/u/KardashevTypeII)
#### Post date: [April 13, 2021, 10:59pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/131 "2021-04-13T22:59:10Z")
Sam,
Hopefully legit shipment to the United States - [2x gold plated 9pin bakelite tube socket testing saver for12AX7 ECC83 5670 SED | eBay](https://www.ebay.com/itm/2x-gold-plated-9pin-bakelite-tube-socket-testing-saver-for12AX7-ECC83-5670-SED/402788520225)
-Fumu / Esopus
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### Author:  [@BratAttack](https://lookmumnocomputer.discourse.group/u/BratAttack)
#### Post date: [April 14, 2021, 3:12pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/132 "2021-04-14T15:12:32Z")
I got these sockets off amazon when I originally put my parts order in for this module. [https://www.amazon.com/gp/product/B08JTMKCHQ/](https://www.amazon.com/gp/product/B08JTMKCHQ/) they are of course more expensive than the ali sockets, but they also are delivered quickly.
The tube pins seem to fit very tightly in it and it takes some considerable effort to rock them into place.
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### Author:  [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)
#### Post date: [April 14, 2021, 9:17pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/133 "2021-04-14T21:17:47Z")
not checked mine again , but it was soldered on the Valve. But I was using the TS100 on 400C so it was in and out like a Ninjaā¦
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### Author:  [@BratAttack](https://lookmumnocomputer.discourse.group/u/BratAttack)
#### Post date: [April 15, 2021, 6:20am UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/134 "2021-04-15T06:20:57Z")
I started building mine up tonight, and I have to say that soldering components directly to vacuum tube socket pins feels very old timey and fun.
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### Author:  [@CyroS](https://lookmumnocomputer.discourse.group/u/CyroS)
#### Post date: [April 15, 2021, 4:17pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/135 "2021-04-15T16:17:10Z")
As requested a back of the board.
Done a continuity test and thereās no shorts with the LEDs/tube pins that I can detect or see!
 
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### Author:  [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)
#### Post date: [April 15, 2021, 8:52pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/136 "2021-04-15T20:52:53Z")
cant see anything obvious ( canāt tell you the colour codes on the resistors are correct ) . Try referencing against the schematic and check continuity and values with a meter , there was one resistor that gave a false result in circuit wheni did this.
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### Author:  [@BratAttack](https://lookmumnocomputer.discourse.group/u/BratAttack)
#### Post date: [April 15, 2021, 9:17pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/137 "2021-04-15T21:17:20Z")
I canāt see what this looks like on the back, but from the front this joint looks a little susā¦
Also are those tantalum caps? if so youāll need to swap them out for ceramic because tantalum caps have polarity. EDIT: Given the description of working and then not workingā¦ that sounds like tantalum caps. I did the EXACT same thing with my build on the K25 LFO. they print those little ā+ā signs on them so smallā¦
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### Author:  [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)
#### Post date: [April 15, 2021, 9:30pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/138 "2021-04-15T21:30:02Z")
Looks like multilayer ceramics from here. Tantalums tend to be a bit rounder when seen from the top (and do they even make 47 nF tantalums?)
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### Author:  [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)
#### Post date: [April 15, 2021, 9:38pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/139 "2021-04-15T21:38:26Z")
They do, and Mouser would sell you one for $20.80, but itās non-stocked.
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### Author:  [@CyroS](https://lookmumnocomputer.discourse.group/u/CyroS)
#### Post date: [April 15, 2021, 9:59pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/140 "2021-04-15T21:59:39Z")
I thought that joint looked a little sus too, from the back it looks fine and continuity test is all fine too.
I appreciate the confusion for the tantalum caps too, but not to worry theyāre standard ceramic cap š
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### Author:  [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)
#### Post date: [April 15, 2021, 10:53pm UTC](https://lookmumnocomputer.discourse.group/t/4710-safety-valve/2789/141 "2021-04-15T22:53:16Z")
I donāt know this PCB, but on your photo the TL072 seems upside down from the writing above and its dot, no ?
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