6AQ5 10watter clip&schem. edit new & last clip

[klingo]

hello guys!

My last built is a two(mixable)channel, 6AQ5 push-pull amp(10watt).

blue channel is a paralleled 12ax7 with tone/vol control going in one input of the phase inverter(~18wlite)

the black channel is taking the signal from this 12ax7 plate and feeding(via a volume control) a 5725/6AS6 wired in triode.then there's a mid cut control(chieftain) and it goes into the second input of the PI.

there's a 3 position switch which remove the black channel/feed it through a cap/resistor network/feed it with full signal.I will say "blue"/"shaped"/"full" positions.

6AQ5 are cathode biased, a 470 ohms/5w each into a 100ohms/3w balance pot.

speakers are fane 2x12" classic 65 in an open back cabinet

Clips were recorded with a (rusty)SM58 direct into the PC mic input. Audacity freeware. NO effect or great playing highlighting the amp.

first clip with my Les Paul studio Gem P90, both pick up ,both guitar vol on 8 and dimed at the end.
blue channel vol 60% tone 60%
black channel vol 40% mid 20%
playing with the switch "blue",then "shaped"

EDIT: file zipped

[klingo]

Second clip with a charvel, jackson Single Coil in the middle and squier(not sure) SC neck pick-up.
both pick-up in action and neck only at the end.
blue ch. vol 65% tone 60%
black ch. vol 45% mid 20%

switch: "blue", then "shaped", then "full".

EDIT: zipped

[klingo]

third clip with Les paul P90 bridge pick-up
all knobs on 10
playing with the switch: "blue"/"shaped"/"full"...feedback..."blue"/"shaped"/"full"

EDIT: zipped

[klingo]

clip number four
5751 in the PI instead of 12at7

gibson P90 both pick-up guitar vol on 5/6
blue ch. vol 0
black ch. vol 90% mid 40%,switch "full", then adding some mids, turning blue ch. vol on 10, guitar vol on 10, switching to bridge pick-up.
may be not in that order!

EDIT: zipped

[Richie]

can't open or play the files

[klingo]

The last clip is an other amp for comparison

It is a 18wliteII, SS rectifier in a Blues Jr cabinet with stock PT and loudspeaker.

the clip show that 18w is louder(and overload the mic settings?) but the Eminence Blues Jr speaker is louder than the Fane (Eminence mid boost)
and the mic may not be at the same distance/height from the speaker.

I've played the 6AQ5 amp with a drummer yesterday and it 's gigable but no clean headroom left.

EDIT: zipped

[klingo]

schematic:

[klingo]

I was able to download & play the files from another location/computer

it's a bit long...

are you encountering problems?

[juse]

can't open or play the files

you probably need winrar to unzip the files (it's shareware - a 40 day trial):

http://www.download.com/3000-2250-10007677.html

These sound files could probably be uploaded without the zip/compression - it's not really saving that much space by zipping them up.

[klingo]

juse wrote:These sound files could probably be uploaded without the zip/compression - it's not really saving that much space by zipping them up.

you are right but .mp3 are not allowed and converted in wave files are too big (5 Mega max)

any ideas?[/b]

[juse]

juse wrote:These sound files could probably be uploaded without the zip/compression - it's not really saving that much space by zipping them up.

you are right but .mp3 are not allowed and converted in wave files are too big (5 Mega max)

any ideas?[/b]

I wasn't aware that mp3s were not supported here. I have noticed many of them, though. For example:

http://ampgarage.com/forum/viewtopic.php?t=3298

I guess these are hosted somewhere else & linked to. Maybe you could use a .zip compression instead of .rar, as most people already have a zip extractor.

Good work on the amp, btw.

[klingo]

hello!

the bad clips i've posted above are not doing justice to this little 6AQ5 amp!

So this is one with a slightly better sound.

The guitarist (me) is still bad

charvel/"rythm" in the middle
gibson/P90 one side "lead"
yamaha/SH4 other side "lead"

[novosibir]

Klingo, in your schem is a lapsus!

In front of V2, above the 1M pot, when the SW.1a is set to the upper pos. to enable signal flow to the 5725's grid, the 1MB, the 470p and the 1M are useless, since they're shunted - might be removed entirely!

Larry

[Voodoo_Man]

Klingo, your new creation sounds great. I have a ton of 6AQ5's. Time to bust'm out and build something. Thanks for the demos.

EDIT: Maybe a half ton.

[klingo]

novosibir wrote:

Klingo, in your schem is a lapsus!

In front of V2, above the 1M pot, when the SW.1a is set to the upper pos. to enable signal flow to the 5725's grid, the 1MB, the 470p and the 1M are useless, since they're shunted - might be removed entirely!

Larry

Thanks for checkin'

schem is not very clear...SW1a & SW1b is the same bipolar, 3 positions switch.

so first (down) position... grid of 5725 and non-inverting input of PI (via 39K) both go to ground..."blue" channel only (blue pots in my amp).

second (middle) position...the signal from V1 must flow through 470p//1M pot//1M res before going to the vol pot (emphasis high and lower RC coupling bass dropping freq.). then V2 signal flow through 124K+39K."blue" + shaped "black" channels (yes...black pots...).

third (up) position...4,7nF cap directly coupled with V2 grid & vol pot ( setting the gain and the RC bass dropping freq). then V2 signal flow through 56K+39K."blue" + full "black" channels.

Amp was tuned with Fane speakers , P90 Gibson...and parts available.

the most expensive tube are (were?) V1/V3 (12ax7/5751/12at7)

5725 sounds good in triode(K=35 Ri=6000 ohms S=5.8mA/V) but the four i have are a bit microphonic.

I hope the schematic to be faithful.

Olivier