Biasing frequency

[gtrjunior]

Hey guys! Just wondering if anyone has experienced the need to bias their Splawn on a more frequent basis.
Only reason I ask:
A few months ago a bought a bias probe and successfully biased my QR( with the help of Splawndude's tutorial....thanks man!!)
Before I biased it I was experiencing some volume fluctuation and so forth.
The bias was very low...25mA. So I did the math and decided to bias ever so slightly hotter at 35mA and it sounds killer. The volume fluctuation thing went away and the amp has operated perfectly ever since.
However!!!
The other day I was playing and I made a couple of adjustments on my delay pedal and just for a split second there was a volume fluctuation.
I recently bought some new cables for my setup and decided to swap them out and I had noticed that one of my patch cables was very slightly retracted from a pedal. So I swapped the new cables and snugged up all of the patch cables and haven't had a problem since.
But I started to wonder if my bias had drifted. I haven't checked it yet, but I will just for the hell of it.
But of course, I'm wondering if anyone else has experienced any type of bias drift or a need to rebias frequently?

[briman]

I have never had to re bias any of my Splawns after initial biasing. Only when i buy new tubes.

[gtrjunior]

Yeah, I suspect that the patch cables were the issue. But of course it can't hurt to check with you guys

[gtrjunior]

I just went downstairs and played it for the last hour or so with no problems....

[briman]

Good. Glad it's ok.

[splawndude]

Glad everything is working properly but yes the bias (on any amp) can drift over time. I've been schooled to bias the amp, unhook the probe, play it real hard for awhile, let it sit idle for a fair bit and then check the bias again before boxing it back up in the headshell. But most probes will let you check the bias without even taking the amp chassis out of the headshell which makes it really easy and safe.

[gtrjunior]

When I biased it originally, I did what you just suggested. I let it idle for about 20min and it held up so I boxed it back up and It sounded and still does sound awesome.
I think the problem was the patch cable because again the other day, I was moving my board and I accidentally brushed up against a pedal and inadvertently semi-unplugged a pedal. And of course, I had only a faint signal coming through. Once I saw the loose connection and fixed it, the Splawn roar was back!!
I do have to say, now that I've got this amp setup and operating properly, it's a beast. I love it.