simplest way : introduce a GNF it will improve the sound as bonus
More complicated : remove the first tube gain... input directly to the grid of the 2n section. get rid of the first section !
More complicated : remove the first tube gain... input directly to the grid of the 2n section. get rid of the first section !
I still think that people are missing the point here! 😕😕
He has a low power HiFi amplifier for audio use with 2A3 output.
He wants to overdrive the output valves into distortion like an EL34 Guitar amp.
For a "Meaty" sound whatever that means. 😱
He has a low power HiFi amplifier for audio use with 2A3 output.
He wants to overdrive the output valves into distortion like an EL34 Guitar amp.
For a "Meaty" sound whatever that means. 😱
Sorry but both you and the OP are "missing the point". 🙁
The guitar player can never overdrive his 100W amplifier, simply because it's too loud and neighbours will call the police.
It is NOT a preamp problem but of way too much power available, which he solves by using an "acceptable power" 5W amp.
The OP *already* has a 5W amplifier, again has NOT a preamp problem, if he likes distorted sound he can run his 5W system full blast and not disturb a sleeping baby.
Changing preamp gain by any means, from using the volume control (which I suggested) to adding an attenuator between stages or pulling a cathode cap (same thing but fixed attenuation 😉 ) to somehow finding a lower gain tube will NOT address the main problem.
If anything, he might build a similar 1W amplifier, IF 5W is still too much.
The guitar player can never overdrive his 100W amplifier, simply because it's too loud and neighbours will call the police.
It is NOT a preamp problem but of way too much power available, which he solves by using an "acceptable power" 5W amp.
The OP *already* has a 5W amplifier, again has NOT a preamp problem, if he likes distorted sound he can run his 5W system full blast and not disturb a sleeping baby.
Changing preamp gain by any means, from using the volume control (which I suggested) to adding an attenuator between stages or pulling a cathode cap (same thing but fixed attenuation 😉 ) to somehow finding a lower gain tube will NOT address the main problem.
If anything, he might build a similar 1W amplifier, IF 5W is still too much.
I agree with JMFahey. This isn't a preamp gain issue, he wants power tube that can be driven to max output but with less output; i.e. 1 watt power tube.
He's already got a less powerful tube than he indicates. It's a 2A3 SE amp so it's really only putting out about 3.5 watts, not 5 watts, if it's made according to the Sun schematic.
I didn't notice the speakers being used but if you want a meaty sound from 2A3 amps, you definately need the right speakers. Speakers of less than 98dB tend to sound a bit congested at normal levels with 3.5 watt amps IMO.
I didn't notice the speakers being used but if you want a meaty sound from 2A3 amps, you definately need the right speakers. Speakers of less than 98dB tend to sound a bit congested at normal levels with 3.5 watt amps IMO.
5 watts can sound very loud, I think he wants a flea watt amp so its running on zero headroom.
6Y6 triode wired?
6Y6 triode wired?
He's only getting 3 to 3.5 watts with the 2A3 but the triode connected 6Y6 will easily do 1.5 watts🙂
My other favourite is the 6EM7 - 2.5 fun filled watts with the driver in the same bottle.
My other favourite is the 6EM7 - 2.5 fun filled watts with the driver in the same bottle.
Hahaha I like the OP's style!
Throw in a dinky output transformer and you got yourself a killer geetah amp😀 Although you'd really want to probably use a pentode for the output valve with zero feedback, and a speaker with a lumpy response too😉
remove one diode of the transformer !
get a huge resistor to ground to get the B+ to sink to 100 V and lower, this will help distortion
get a huge resistor to ground to get the B+ to sink to 100 V and lower, this will help distortion
Believe me, there is plenty of power left if I reduce the gain. For normal listening levels I use maybe 5% of the 3.5 watts. The Sun Audio clone amp handles the two horns, that I sculpted on the balcony. Hf rolloff is okay as long as the amp can still produce sound above 440 Hz. The JBL 2225H woofers are handled by my DIY Firstwatt F5.
I am not sure either if lowering gain will improve sound quality. I don't need that much gain, so why have it? Especially if electric guitarists like the sound when the power tubes are more in use. I not after over-drive sound, but neither are some guitarists. Musicians use their gear for clean guitar tone as well you know. Not to confuse anyone again, I am using a hifi tube amp for hifi speakers, and I hope the photo will help against further confusion on this topic. For anyone interested, that is a darn good IPA from Quebec.
Thanks for more suggestions. Not sure about the last suggestion to remove diodes. You are not speaking to a tube amp guru. The Firstwatt solid state amp was easy compared to a tube amp. I have upgraded a few caps in the tube amp, that is all. I may dare to make a few small mods.
About the suggestion to build a 1 watt amp: 1st - I already have an amp, and I just need to reduce the gain on the preamp tubes. 2nd: I have not found a 1 watt 2A3 tube amp design. 3rd: Seems expensive to start over.
I am not sure either if lowering gain will improve sound quality. I don't need that much gain, so why have it? Especially if electric guitarists like the sound when the power tubes are more in use. I not after over-drive sound, but neither are some guitarists. Musicians use their gear for clean guitar tone as well you know. Not to confuse anyone again, I am using a hifi tube amp for hifi speakers, and I hope the photo will help against further confusion on this topic. For anyone interested, that is a darn good IPA from Quebec.
Thanks for more suggestions. Not sure about the last suggestion to remove diodes. You are not speaking to a tube amp guru. The Firstwatt solid state amp was easy compared to a tube amp. I have upgraded a few caps in the tube amp, that is all. I may dare to make a few small mods.
About the suggestion to build a 1 watt amp: 1st - I already have an amp, and I just need to reduce the gain on the preamp tubes. 2nd: I have not found a 1 watt 2A3 tube amp design. 3rd: Seems expensive to start over.
Attachments
Last edited:
That is what I asked for from the beginning. Looks a bit more complicated that just swapping tubes though.
I tried full blast at a party once. I think I woke up babies in neighbouring countries.
I am good to go. Free on Sunday to start modding. I could drill a toggle switch, with or without my resistor of choice, to know instantly if I like the sound or not. If this project is scrapped I can always use the switch for LED lights a la McIntosh. 😛 Which range of resistors do you think will work best? And how many watts should they handle?
Not complicated at all. Just pop in the tubes and the adapters and it's done.
Nothing to adjust or change. Instant lower gain.
I found this adapter, but it does not look like it fits the 6SN7 socket. Which adapters did you use?
I think I found your setup. Looks like a custom job.
Attachments
- Status
- Not open for further replies.