(I think) Wolf and bow vibration after recent rehair
I got my main viola bow rehaired a few weeks ago, and since then it's been AWFUL to play. The bow seems to vibrate a lot, particularly around 2/3 way up, there are far more wolfy tones, particularly on the G and D strings. I tried playing my viola with a non-recently rehaired bow and most of these problems seem to have gone away. Does anybody have suggestions for what may have gone wrong? I've gotten rehairs from this person several times before, but it had been (gasp) two years since the last one.
I don't believe i've suddenly become a worse player but that's of course always a possibility ;)
Do you mean 2/3 of the way to the tip or frog - or 2/3 of the way from the end of the fingerboard to the bridge?
The balance point will change slightly on a rehair depending on how much the hair was stretched out, so double check to make sure the hair length is good, there may also be more or less hair then before. Less hair on a strong stick will make the bow very bouncy. Information about hair quantity: https://adbowsllc.com/2018/06/11/determining-hair-length-and-quantity/
Do you use light pressure on the bow?
Wolf tones can be caused by a vibrational feedback from the plate through the bridge into the string, and this effect can change slightly depending on the stiffness/elasticity of the hairs.
This is the first time I have heard the suggestion that a bow can cause a wolf tone. Experiment: Try that bow on several other Violas, and try several bows on your Viola, if you have a close violin shop, or are in a functioning orchestra.
Thanks for the suggestions! I'm going to clean a comb and check the hairs out. A half turn looser does seem to help a bit. I'll try to do the light pressure high tension exercise to more precisely locate the trouble spots.