I have had this old Traynor YC-610 for over 10 years. It was given to me by my cousin gratis. It only had 3 of the original speakers in it two of which had nail polish repairs. With it's 610 capacity and relative small size (for a 610) I finally decided to see if I can get her to sing again.
Because the value of a fully functional YC-610 is so low, aprox. $225 ish, I had to keep the replacement speakers at a reasonable cost in case the cabinet didn't sound to my liking. I ended up selecting the Eminence Alpha 10A's for their ability to operate in a sealed enclosure close to the YC-610, weight, frequency response, and price!
The original speakers are Marsland a Canadian company that doesn't make replacements for these. The Eminence Alpha 10A's look very similar but have a much higher power rating than the 25W Marsands but weigh the same.
I lined the cab with poly fill purchased from a fabric shop after consulting a few TB'ers about it. The poly fill is supposed to clean up the mids by reducing reflections and because it takes up space in the actual cabinet it pushes the YC-610's volume #'s closer to the Alpha 10A's ideal internal volume.
The only difficult part was removing the old gaskets but they were just paper and came off easy. Just messy that's all. The new ones mounted in great.
Overall sound is actually pretty good. I have quite a bit of nice gear to compare it to and I've noticed it's breaking in nicely. Off the hop it has a aggressive rock sound that goes quite deep with a slight bump at 100 Hz that really makes it cut. I know it's at 100 Hz because a little parametric action (-2 db at 100 Hz) really leveled the whole thing out to sound rather articulate and full.
I put my VTBass into my 800Watt P.A. amp and man did this thing put a smile on my face!! The sound was all I could have hoped for. It handles the low B with flair and fashion. My house took a beating that I've never subjected it to with any other bass rig. I was really concerned about the drywall joints cracking for a bit there... no joke. I haven't used it on a gig yet and probably won't for some time. This was a just in case I'm doing an outdoor session and want to bring the big boy with me. I'll revive this thread when I do and post my findings. I wanted to wait and hear the cab before I invested the money to recover the speaker grille. After hearing it, I have no problems with the extra investment to restore the grill to new vintage and scrub the tolex clean. Here's some of the gear I compared it with to evaluate the new speakers.
Amps:
Eden WT-400 PLUS
MESA Walkabout
SWR Baby Baby Blue II
M1610 P.A. (Power section only with VT Bass pre)
Cabs:
D410 XLT
SWR Golliath Jr. II
SWR Big Ben
MESA Radiator 12
MESA Scout
SWR Baby Baby Blue 110 + piezo combo
Restoration of an old Traynor YC-610. With pics. 
