Quick Rod Tubes?

[tx6strings]

Anyone know what tubes (pre and power) Splawn’s currently shipping new Quick Rod’s out with? I have a used 2014 which has a volume swell up to normal volume after taken off standby (no matter how long). I sent an email and they responded saying to troubleshoot the tubes so I’m looking at just replacing all of them. Thanks!

[gtrjunior]

I would just buy replacement tubes from a Scott.
If you have the stock tubes in your amp they will have a sticker with a number on them. Just tell Scott what # tubes you have and he will send out a replacement set.
Iirc, he is using a Chinese EL34B but I’m not exactly sure what brand. I’d guess Shuguang.

[schmasty]

gtrjunior that is some solid advice.. tx6strings I have ordered my power tubes from Scott as mentioned let him know the number on the sticker on the base of the power tube and you should be good to go.. As far as pre amp tubes check out dougs tubes I have had good luck with him..

[briman]

Yup good advice Gtrjunior! If you buy elsewhere you will need to pill chasis out and bias.

[cvogue]

Nov 2, 2017 13:17:10 GMT -5 briman said:

Yup good advice Gtrjunior! If you buy elsewhere you will need to pill chasis out and bias.

Do you not need to bias if you use power tubes from Scott?  I know they're numbered but is that enough?

[gtrjunior]

Nov 4, 2017 18:57:25 GMT -5 cvogue said:

Nov 2, 2017 13:17:10 GMT -5 briman said:

Yup good advice Gtrjunior! If you buy elsewhere you will need to pill chasis out and bias.

Do you not need to bias if you use power tubes from Scott?  I know they're numbered but is that enough?

Well, the numbering system will put you really close...
BUT...I ALWAYS BIAS.

[tx6strings]

So I open up the amp and all but V2 are running JJs. V2 is a Splawn labeled Sovtek 12AX7B. I ordered 4 Ruby EL34s and 4 EH 12AX7s (not sure if I’ll leave the Splawn pre in V2 or not.

Any one know Splawn recommended bias settings for a Quick Rod with the B+ mod?

[briman]

Good question. Might be same as stock QR but not sure so you better ask Scott. Yiu could always just check what the current ones are biased at to get a ball park idea. I have the b+ option on one of my QR's but it is brand new pretty much and won't need tubes for a couple of years as i don't use it everyday and at bedroom volume. I use the one downstairs more as my wife is upstairs most of time lol

[cvogue]

Nov 12, 2017 16:19:46 GMT -5 briman said:

Good question. Might be same as stock QR but not sure so you better ask Scott. Yiu could always just check what the current ones are biased at to get a ball park idea. I have the b+ option on one of my QR's but it is brand new pretty much and won't need tubes for a couple of years as i don't use it everyday and at bedroom volume. I use the one downstairs more as my wife is upstairs most of time lol

You're lucky!  I usually have to practice through headphones, any live stuff (especially distorted) gets the wifely kibosh in about 5 minutes.  Can't say I blame her though, who wants to listen to someone figuring out a song. :/

[gtrjunior]

When you bias, you want to d your calculations based off of the B+ being off....your bias should be somewhere around 32mA.
splawndude did a great video with a step by step tutorial. Let me see if I can find it.
Do you have a bias probe?

[gtrjunior]

Found it. It’s a good read and he did a thorough job of covering the procedure. If you need a bias probe I’d recommend the eurotubes one.

www.eurotubes.com/store/pc/Eurotubes-Pro-One-Bias-Probe-for-octal-power-tubes-p144.htm

It’s not exactly cheap but it’s foolproof. It gives you the plate voltage which you’re going to need to do your calculations.


My Amp Biasing Tutorial
r.tapatalk.com/shareLink?share_fid=108332&share_tid=7786&share_pid=104725&url=https%3A%2F%2Fsplawnfans%2Eproboards%2Ecom%2Fpost%2F104725%2Fthread%2F7786&share_type=t

[tx6strings]

My B+ Mod isn’t switchable. I have bias probe and am familiar with the procedure. I guess I’ll need to measure the plate voltage or call Scott

[gtrjunior]

Hmm...I’m not familiar with a non switchable B+, so maybe calling Scott might be your best bet.
Mine has a switch on the back panel for B+.

Iirc, my plate voltage is around 490 with the B+ off and when it is on it drops to about 425. Which is about where my Marshall is.

[splawndude]

Nov 12, 2017 21:39:34 GMT -5 tx6strings said:

My B+ Mod isn’t switchable. I have bias probe and am familiar with the procedure. I guess I’ll need to measure the plate voltage or call Scott

Yeah. Just get the plate voltage reading and go from there.



also-
In general, as long as you are buying tubes from a reputable distributor and can count on then giving you a matched set to begin with - that is all that matters.