Pianotech

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

Actually, the bigger a piano gets the smaller the diameter becomes on the lower strings. At 50, it could easily be time for new bass strings. I'm doing a Kawai right now from 1987. It was time. 

Peter Grey Piano Doctor 

Actually, the bigger a piano gets the smaller the diameter becomes on the lower strings. At 50, it could easily be time for new bass strings. I'm doing a Kawai right now from 1987. It was time. 

Peter Grey Piano Doctor 

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

Thank you for taking the time to reply. I have a customer with a new C2 with a wonderful bass. It's a great piano. I'm thinking of calling one of the better base string makers for advice. Usualy the level of pianos I do I go to Mapes and I've been happy. This piano and the theater that has it, deserve a bit better. Thanks again!

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

Your problem does not come as a surprise to me. It is no secret that Yamaha bass strings often do not have a long lifespan, at least not in terms of musicality.

While I have a few German pianos that still have decent sounding original bass strings at over 100 years of age, often I find Yamaha  bass strings begin to die after 30 - 40 years. They lose their roundness and depth of tone, and begin to sound muddy and tubby. New strings will be a huge upgrade for a piano like that.

Thank you for taking the time to reply. I have a customer with a new C2 with a wonderful bass. It's a great piano. I'm thinking of calling one of the better base string makers for advice. Usualy the level of pianos I do I go to Mapes and I've been happy. This piano and the theater that has it, deserve a bit better. Thanks again!

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

My experience in this regard is is consistent with Jurgen's. In fact, when some Yamaha techs and corporate folk came to visit Cal Arts recently, I showed them one of our 30-plus year old G1 grands in a practice room. They remarked at how good the sound was, and then I told them that it had Ronsen hammers and GC bass strings.

Big improvements over the original parts.

Alan 

Your problem does not come as a surprise to me. It is no secret that Yamaha bass strings often do not have a long lifespan, at least not in terms of musicality.

While I have a few German pianos that still have decent sounding original bass strings at over 100 years of age, often I find Yamaha  bass strings begin to die after 30 - 40 years. They lose their roundness and depth of tone, and begin to sound muddy and tubby. New strings will be a huge upgrade for a piano like that.

Thank you for taking the time to reply. I have a customer with a new C2 with a wonderful bass. It's a great piano. I'm thinking of calling one of the better base string makers for advice. Usualy the level of pianos I do I go to Mapes and I've been happy. This piano and the theater that has it, deserve a bit better. Thanks again!

 I have a G2 that has great bass strings and in fact that model was/is considered one of the best Yamaha Grands at 5'8". Anyway I suggest you get a new set of bass strings made and talk with James Arledge or whatever string maker you choose. a 1977 Grand is getting close to 50 years old so there is the age issue. Perhaps you need to run a rescaling program . How is the crown of the soundboard ? Could you describe what a "burble" is ? Maybe the bass strings are not the right size since you mentioned they are thin. I would expect thick, double wound strings on a 6'7" Yamaha

I service several Yamaha concert grands that are 30 to 50 years old, all original and bass sounds great. Maybe they used better quality strings on concert grands. Just to give credit where it's due. 

My experience in this regard is is consistent with Jurgen's. In fact, when some Yamaha techs and corporate folk came to visit Cal Arts recently, I showed them one of our 30-plus year old G1 grands in a practice room. They remarked at how good the sound was, and then I told them that it had Ronsen hammers and GC bass strings.

Big improvements over the original parts.

Alan 

Your problem does not come as a surprise to me. It is no secret that Yamaha bass strings often do not have a long lifespan, at least not in terms of musicality.

While I have a few German pianos that still have decent sounding original bass strings at over 100 years of age, often I find Yamaha  bass strings begin to die after 30 - 40 years. They lose their roundness and depth of tone, and begin to sound muddy and tubby. New strings will be a huge upgrade for a piano like that.

Thank you for taking the time to reply. I have a customer with a new C2 with a wonderful bass. It's a great piano. I'm thinking of calling one of the better base string makers for advice. Usualy the level of pianos I do I go to Mapes and I've been happy. This piano and the theater that has it, deserve a bit better. Thanks again!