An "Omage" to Harvey Gerst - D130 Question

[jackrhein]

It certainly is an honor to have my first query answered by the big man himself, Wow! Thanks Harv.
I have another question: I want to use a d130 to replace the two 12 Jensens in my 1965 silvertone 1484 piggy back amp. (It has two 6L6's in a push pull circuit, but I don't know how many ohms the amp is looking for) I don't know if I should use a 16 ohm or a 8 ohm speaker. The problem is that the amp is too loud for my requirements so i was thinking of using a 16 OHM speaker to soak up some of the power. I read some other missives about the cab size and sound deadening material which I will also incorporate but I still need to get the amp up to "3" or "4 " to get the full amp character.

[jackrhein]

i wonder why my original thread was moved

[Titanium Dome]

It was in the wrong forum.

Originally, you posted it (twice) in the "Music" forum in "Lansing Related Forums." The content of your thread really is about a Lansing product, D130, and some do-it-yourself modifications, so it was moved here. In moving it, the double posting was eliminated, too.

So it was a little bit of housekeeping, nothing more.

Just to be very clear, I PMed a moderator and suggested he look at the posts and move them to an appropriate place. I don't know if anyone else mentioned, too. Whatever the case, the intent was just to get the thread into the right forum.

Hope this helps.

[Harvey Gerst]

It certainly is an honor to have my first query answered by the big man himself, Wow! Thanks Harv.
I have another question: I want to use a d130 to replace the two 12 Jensens in my 1965 silvertone 1484 piggy back amp. (It has two 6L6's in a push pull circuit, but I don't know how many ohms the amp is looking for) I don't know if I should use a 16 ohm or a 8 ohm speaker. The problem is that the amp is too loud for my requirements so i was thinking of using a 16 OHM speaker to soak up some of the power. I read some other missives about the cab size and sound deadening material which I will also incorporate but I still need to get the amp up to "3" or "4 " to get the full amp character.

First, we hafta figure out what the load is now, so get a multi meter and measure the DC resistance of the speakers. Then, we can work from there.

[duaneage]

IIRC tube amps don't like higher impedance loads. If it is too loud could you just adjust the gain down a bit or does this amp go to 11?

[jackrhein]

It had 2 jensen 8 ohm speakers wired in parallel which it would have made the amp originally looking for a 4 ohm load. Do think a 16 ohm load would change change the tone or fry the output transfromer?.

[Zilch]

Well, we've got one post that tube amps don't mind higher impedance loads, and one that says they don't mind them.

[Somebody gotta get definitive soon.... ]

[4343]

Well, we've got one post that tube amps don't mind higher impedance loads, and one that says they don't mind them.

[Somebody gotta get definitive soon.... ]

Maybe not definitive, but "hear" goes...

Rules of thumb:

SS Amps don't like Shorts, Tubes/Valves don't mind so much.
Tube/Valve Amps don't like Opens, Solid State don't mind at all in most cases.

Me, I wear shorts in the open, most of the year...

There are several commercial products designed to lower the level to the speakers, "Power Soak" by Tom Sholtz for instance.

[Allanvh5150]

Well, we've got one post that tube amps don't mind higher impedance loads, and one that says they don't mind them.

[Somebody gotta get definitive soon.... ]

I will give you a definative answer. It depends very much on the clever guy that designed the output transformer. Having the correct impedence load on the output transformer will result in a better power transfer. If you use a mismatched load the power transfer won't be as good. It generaly wont harm most amplifiers and it could result in a different sound that is to your liking.

[jcrobso]

It certainly is an honor to have my first query answered by the big man himself, Wow! Thanks Harv.
I have another question: I want to use a d130 to replace the two 12 Jensens in my 1965 silvertone 1484 piggy back amp. (It has two 6L6's in a push pull circuit, but I don't know how many ohms the amp is looking for) I don't know if I should use a 16 ohm or a 8 ohm speaker. The problem is that the amp is too loud for my requirements so i was thinking of using a 16 OHM speaker to soak up some of the power. I read some other missives about the cab size and sound deadening material which I will also incorporate but I still need to get the amp up to "3" or "4 " to get the full amp character.

Most guitar speakers have a sensitivity rating of 92~95db. Lets say the Jensen's are 94db for one speaker, two speakers will give 97 db. The sensitivity for a D130 is 101db, so the amp will play louder with the D130.

I suggest that you get a 100W 8 Ohm L-pad connect this between the amp and the speakers. The amp will see 8 Ohms and you can turn down the speakers to a lower level. If you want to use a D130 to get better over all sound GO FOR IT!!! John