Battery Sale!
- Thread starter Sonido
- Start date
aragorn723
New member
Right, I understand the voltage, do you use a bunch of battery holders?? (is it a separate chassis?)
aragorn723
New member
Thats cool, looks like there's a lot of options for the 9 volts, how about the d-batteries? (since they last the shortest). Maybe 2 d cells in series for each filament?
That's a good idea. Power both ends and not the middle. 2 batteries with half the current draw. Should last 4 times as long.
Gonna get me 2 more D cell holders -
Brain fart. Half the current but through both batteries. Just twice the life. Zero sum gain.
Not nearly as good as the 24 AA thing, same cash for 4X the life.
Ooupps.
Gonna get me 2 more D cell holders -
Brain fart. Half the current but through both batteries. Just twice the life. Zero sum gain.
Not nearly as good as the 24 AA thing, same cash for 4X the life.
Ooupps.
aragorn723
New member
Sounds right to me, that would increase the capacity by double and would mean less trips to the store I thought about AAs- the info i found said 8000 mAh for D batteries and AAs have a capacity of 900 mAh.. Which would mean you need 9 of them to have the same capacity as the D battery, and 18 to double the capacity... per side! (So 36 batteries total for the D's LOL). I'm picturing one of those James Bond suitcases where the guy opens it up and there's a whole bunch of wires hanging out 8) If the price was right, it might be worth it!
I thought about AAs- the info i found said 8000 mAh for D batteries and AAs have a capacity of 900 mAh.. Which would mean you need 9 of them to have the same capacity as the D battery, and 18 to double the capacity... per side! (So 36 batteries total for the D's LOL). I'm picturing one of those James Bond suitcases where the guy opens it up and there's a whole bunch of wires hanging out 8) If the price was right, it might be worth it!aragorn723
New member
Around 1 volt the d cells stop working.charger said:
Paul Joppa
Moderator
I do not recommend using the 3-volt filament option because the plate voltage is so low, the portion of filament is practically cut off. This will increase the output impedance and the distortion.
You can however parallel multiple cells for longer life. Sometimes AAs are cheaper than Ds per amp-hour, so a pack of paralleled AAs could be more economical.
Long ago there was a large single carbon-zinc cell called No.6. They were about 2.5" diameter and 6.75" long. I don't think anyone ever made an alkaline in that format. They may still exist, but carbon-zinc cells have a short shelf life and less than half the capacity of alkaline even when fresh, so it's not that great a deal.
There also used to be an F cell (IIRC) which was a longer D cell, 1.5 times as long. It went into 6-v lantern batteries, and was made in alkaline chemistry. But it seems to have disappeared, the lantern batteries these days are 1/3 air and 2/3 D cells. 12v lantern batteries also still exist, but in carbon-zinc only.
Wikipedia http://en.wikipedia.org/wiki/List_of_battery_sizes says the PP-9 size is used in marine applications and is still available, it's a 9-v battery with 5000mA-h capacity(!) - but again, only in carbon-zinc as far as I can tell.
You can however parallel multiple cells for longer life. Sometimes AAs are cheaper than Ds per amp-hour, so a pack of paralleled AAs could be more economical.
Long ago there was a large single carbon-zinc cell called No.6. They were about 2.5" diameter and 6.75" long. I don't think anyone ever made an alkaline in that format. They may still exist, but carbon-zinc cells have a short shelf life and less than half the capacity of alkaline even when fresh, so it's not that great a deal.
There also used to be an F cell (IIRC) which was a longer D cell, 1.5 times as long. It went into 6-v lantern batteries, and was made in alkaline chemistry. But it seems to have disappeared, the lantern batteries these days are 1/3 air and 2/3 D cells. 12v lantern batteries also still exist, but in carbon-zinc only.
Wikipedia http://en.wikipedia.org/wiki/List_of_battery_sizes says the PP-9 size is used in marine applications and is still available, it's a 9-v battery with 5000mA-h capacity(!) - but again, only in carbon-zinc as far as I can tell.
-Paul Joppa said:
If you connected the negative leads of each battery to each other, then connected that to pin 5, then connected each red lead to 1/7, couldn't one get away with this without running into cutoff? (Switching power setup like this would be kind of a PITA)
aragorn723
New member
Paul Joppa said:
Paul Joppa
Moderator
Hah! Didn't think of that - one cell for each half filament. Should work fine.Caucasian Blackplate said:
charger said:
I think the next least expensive directly heated tube preamp might be the BeePre...
I figure the AA's ought to last a year, the D's 3 months. I just bought 2 years worth of AA and 1 year of D for twenty bucks. That should be about 30 bucks for 2 years. About a buck and a quarter a month.
Change the D's with the change of season and the AA's every new year. Cost 4 cents a day.
I base this on my listening habit of about 2 hours a day, nine to eleven PM, every night before I go off to sleep.
I don't see a problem.
Change the D's with the change of season and the AA's every new year. Cost 4 cents a day.
I base this on my listening habit of about 2 hours a day, nine to eleven PM, every night before I go off to sleep.
I don't see a problem.
aragorn723
New member
Caucasian Blackplate said:
Out of curiosity, how does the BeePre differ in sound from the Quickie?
galyons
New member
charger said:
Feeding with batteries is not an issue, but actually a design plus. I moved from 4 9v batteries to 3 12v SLA batteries. I keep the 12v batteries at full charge, when not playing), with an inexpensive float charger. The only hassle is just charging 1 battery at a time. I will likely change the D cells to rechargeable's in the near future.
Another good sounding cheap tube preamp is an oxymoron. To get "cheap", it is usually the critical power supply where cost and quality are cut.
Cheers,
Geary