I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Moderators: pompeiisneaks, Colossal
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Either Ampeg B15N uses 6k6 OT with 6L6's and the Standell 25L15.
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
kagliostro, you are referring to the user of the italian forum, I guess.
AFAIK he has around 250V B+ and 6k6 on the 6V6s, cathode grounged through a 220R//(some uF) in common.
He noticed low output power even with 30Vpp on the grids of the 6V6s.
AFAIK he has around 250V B+ and 6k6 on the 6V6s, cathode grounged through a 220R//(some uF) in common.
He noticed low output power even with 30Vpp on the grids of the 6V6s.
- Kagliostro
- Posts: 525
- Joined: Wed Dec 30, 2009 12:09 am
- Location: Italy
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Ciao Roberto
Yes, of course
I think the voltage is adequate for the 6aq5 tubes, but is low for the 6v6
and I asked about other circuits using 6v6 and 6.6k OT as to give a look to
the level of B+ used as to confirm my idea about a weak voltage
---
@ Stevem
The PT has a 225v-0-225v AC so no problem for the ez81 rectifier
@ M Fowler
Thanks but I was asking about 6v6 and 6.6k OT, not 6L6
anyway thanks
K
Yes, of course
I think the voltage is adequate for the 6aq5 tubes, but is low for the 6v6
and I asked about other circuits using 6v6 and 6.6k OT as to give a look to
the level of B+ used as to confirm my idea about a weak voltage
---
@ Stevem
The PT has a 225v-0-225v AC so no problem for the ez81 rectifier
@ M Fowler
Thanks but I was asking about 6v6 and 6.6k OT, not 6L6
anyway thanks
K
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
The low B+ does not explain why the output power is so low. As you saw from the datasheet, with B+ = Eg2 = 250V and Ra-a = 10k, you can still get 10W from a pair of 6V6GT.Kagliostro wrote:Ciao Roberto
and I asked about other circuits using 6v6 and 6.6k OT as to give a look to
the level of B+ used as to confirm my idea about a weak voltage
- Kagliostro
- Posts: 525
- Joined: Wed Dec 30, 2009 12:09 am
- Location: Italy
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Yes, but with 10k load, not 6.6k load
So I mean there is a low B+ with respect to the OT impedance, or, if you look to this thing from one other perspective, there is a too low primary impedance of the OT for that B+
K
So I mean there is a low B+ with respect to the OT impedance, or, if you look to this thing from one other perspective, there is a too low primary impedance of the OT for that B+
K
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Yes, you can get more power from a 10k OPT, but you still have not found out why the amp was only putting out 3.5W when it should be closer to 7W... looking at other schematics is not going to help you fix the problem that you have with the existing amp.Kagliostro wrote:Yes, but with 10k load, not 6.6k load
So I mean there is a low B+ with respect to the OT impedance, or, if you look to this thing from one other perspective, there is a too low primary impedance of the OT for that B+
K
- Kagliostro
- Posts: 525
- Joined: Wed Dec 30, 2009 12:09 am
- Location: Italy
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
With 250 V B+ you can have 250 Vpp maximum (hideally) on the primary winding.
With a 6600 to 8 Ohm transformer, you will get no more than 8,7 Vpp on the secondary, so 4,7 Wrms. I've suggested to connect a 16 Ohm speaker to the 8 Ohms tap.
With a 6600 to 8 Ohm transformer, you will get no more than 8,7 Vpp on the secondary, so 4,7 Wrms. I've suggested to connect a 16 Ohm speaker to the 8 Ohms tap.
- Kagliostro
- Posts: 525
- Joined: Wed Dec 30, 2009 12:09 am
- Location: Italy
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
And that seems a good choice
K
K
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Don't you mean 500Vpp or 250Vp?roberto wrote:With 250 V B+ you can have 250 Vpp maximum (hideally) on the primary winding.
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
I'm selling a "p". Anyone interested please call 555-U-R-RIGHT.
Thanks.
Thanks.
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Interesting tube choices on the schematics posted earlier.
The 7 pin pentode 5654 has a Mu of 2550
And the EF86 Mu is 5000
Does someone have a pile of 7 pin tubes?
The 7 pin pentode 5654 has a Mu of 2550
And the EF86 Mu is 5000
Does someone have a pile of 7 pin tubes?
Tom
Don't let that smoke out!
Don't let that smoke out!
- Kagliostro
- Posts: 525
- Joined: Wed Dec 30, 2009 12:09 am
- Location: Italy
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Those tubes are easy to be find
https://tubedepot.com/products/5654-6ak5w-6096
https://tubedepot.com/products/6101-6j6wa
https://tubedepot.com/products/6005-6aq5w
http://www.thetubestore.com/Tubes/6A-Ty ... -EF95-5654
http://www.thetubestore.com/Tubes/6J-Types/6J6-ECC91
http://www.thetubestore.com/Tubes/6A-Ty ... -6HG5-6005
K
https://tubedepot.com/products/5654-6ak5w-6096
https://tubedepot.com/products/6101-6j6wa
https://tubedepot.com/products/6005-6aq5w
http://www.thetubestore.com/Tubes/6A-Ty ... -EF95-5654
http://www.thetubestore.com/Tubes/6J-Types/6J6-ECC91
http://www.thetubestore.com/Tubes/6A-Ty ... -6HG5-6005
K
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
Can anyone explain impedance and loadline when you use a VVR on B+.
how can it work properly with a fixed impedance. Everyone seems to hold to using plate voltage and load line to determine correct ot primary imedance ?
so when B+ is wildly variable what happens to all the formulaes for proper design ? I must be missing something ?
how can it work properly with a fixed impedance. Everyone seems to hold to using plate voltage and load line to determine correct ot primary imedance ?
so when B+ is wildly variable what happens to all the formulaes for proper design ? I must be missing something ?
- martin manning
- Posts: 13080
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: I'm lookimg for 6v6 PP amp schematics that uses 6.6k OT
The screen voltage is reduced along with the plate voltage, so the match to the load impedance stays roughly the same. Voltages scale together, and current scales like voltage to the 3/2 power (Child-Langmuir law).billyoung wrote:Can anyone explain impedance and loadline when you use a VVR on B+.
how can it work properly with a fixed impedance. Everyone seems to hold to using plate voltage and load line to determine correct ot primary imedance ?
so when B+ is wildly variable what happens to all the formulaes for proper design ? I must be missing something ?