Just remove the top jack and it's 1M resistor. Connect pin 2 to pin 7 directly on the tube socket. The "parallel" jack becomes your single jack.How would I use that circuit with only one input jack?
What to do with Magnavox 6v6 amp?
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Re: What to do with Magnavox 6v6 amp?
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Re: What to do with Magnavox 6v6 amp?
Based on the 5F2 this will be a start point, then I think you must tweak R1 - R2 - C2 (may be only C2)
EDIT: The schematic is missing of the plate resistor and PS connection of V1b - see further post
the same way is to do with the 18W preamp
Franco
EDIT: The schematic is missing of the plate resistor and PS connection of V1b - see further post
the same way is to do with the 18W preamp
Franco
Last edited by Kagliostro on Sun Mar 26, 2017 10:38 pm, edited 1 time in total.
Re: What to do with Magnavox 6v6 amp?
Advice so far spot on. Particularly mid-50s Gibson. Be prepared for fairly clean low gain tone. One small thought is a sub-mini pentode. There is at least one equivalent to 6AK5, perhaps slightly lower dissipation. That shouldn't matter. Less microphonic and could perhaps fit a socket where the RCA input jack is now.
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Re: What to do with Magnavox 6v6 amp?
No, no ef86 / 6267.BTW, have you an ef86 ?
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Re: What to do with Magnavox 6v6 amp?
Thanks Franco, this looks good.Kagliostro wrote: ↑Sat Mar 25, 2017 11:41 pm Based on the 5F2 this will be a start point, then I think you must tweak R1 - R2 - C2 (may be only C2)
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Re: What to do with Magnavox 6v6 amp?
If you want use only an input jack
Oh, I forgot, is good practice to replace the old electrolitic caps, they are source for problems
EDIT, Stop ALL, I forgot the second triode plate resistor and supply connection
Franco
Oh, I forgot, is good practice to replace the old electrolitic caps, they are source for problems
EDIT, Stop ALL, I forgot the second triode plate resistor and supply connection
Franco
Last edited by Kagliostro on Sun Mar 26, 2017 10:39 pm, edited 1 time in total.
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Re: What to do with Magnavox 6v6 amp?
I apologize
Here is the corrected schematic
Franco
p.s.: No 6SJ7 tubes on stock ??
Here is the corrected schematic
Franco
p.s.: No 6SJ7 tubes on stock ??
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Re: What to do with Magnavox 6v6 amp?
Thanks Franco, sorry work got in the way this week.
No 6Sj7 either, besides 12AX7's I have these:
- 12BH7A - Noval (similar or equiv: CV5042)
- 6973 - Noval (similar or equiv: 6CZ5)
- 6CB6A - 7-pin (similar or equiv: CV8926, EF190)
- 6DJ8 - Noval (similar or equiv: 6N23P, CV5358, ECC88)
Re: What to do with Magnavox 6v6 amp?
Might be workable. Small signal pentode with similar basing to 6AK5. Different specs. Potentially microphonic. Need to work through biasing detail. Adventure. Perhaps better to spend a bit for a well known quantity. Sleeve of 5x 6AK5 should be <$30 with shipping.nsmith01tx wrote: ↑Fri Mar 31, 2017 5:50 pmNone of which look equivalent to what you've suggested.
- 6CB6A - 7-pin (similar or equiv: CV8926, EF190)
Best .. Ian
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Re: What to do with Magnavox 6v6 amp?
If you haven't a known usable pentode, go with a 12ax7
search a circuit of your interest that uses only one tube
for space reasons (you have seen there are many possibilities) and build it
Franco
search a circuit of your interest that uses only one tube
for space reasons (you have seen there are many possibilities) and build it
Franco
Re: What to do with Magnavox 6v6 amp?
6U8a triode/pentodes are plentiful and cheap. The triod could be used to drive the pentode or as a cathode follower. It's a nice sounding tube, similar to 7199 with different pinout.
Jaff Woolsey at Sonic Dude Ranch has an input jack mounted LND150 circuit board preamp that is very transparent, if you don't mind a little sand in your box.http://sonicduderanch.com/products/jack-boost
Jaff Woolsey at Sonic Dude Ranch has an input jack mounted LND150 circuit board preamp that is very transparent, if you don't mind a little sand in your box.http://sonicduderanch.com/products/jack-boost
Steve
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Re: What to do with Magnavox 6v6 amp?
6N2P is the cheap russian version of the 12ax7 (european ECC83)
you can find on the cheap also the 6n2p-EV (or EB, is the same) they are strong long life military versions
the only bad thing is they are only 6.3v heater, no 12.6v heater connection
the good thing is that pin 9 is connected to an internal shield between the two triodes and you can
find it useful in some projects
http://tubes-store.com/advanced_search_ ... words=6n2p
Franco
you can find on the cheap also the 6n2p-EV (or EB, is the same) they are strong long life military versions
the only bad thing is they are only 6.3v heater, no 12.6v heater connection
the good thing is that pin 9 is connected to an internal shield between the two triodes and you can
find it useful in some projects
http://tubes-store.com/advanced_search_ ... words=6n2p
Franco
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Re: What to do with Magnavox 6v6 amp?
Sorry for the long delay on this ... working on a 5e3 clone now. I'll get back to this as soon as I have that together.
Again, thanks for all the help.
Again, thanks for all the help.