Hi,
I built a carbon fiber laminated MDF loudspeaker using Raven R2-PHL 1120 and PHL 3003 drivers. The active crossover is an audio-kit crossover at 300Hz and 2.5Khz
http://www.audio-kits.com/catalog/item/4071180/3884480.htm
I build 3 channels of Sun Audio sv2a3 based SET (using a single power supply) to power one single speaker for testing. This is a simple 6sn7 cascade - 2a3 design. The sound is good and I am looking for suggestions on how to optimize my second build. Based on the initial listening, I am thinking of making the following modifications:
a) Separate power supplies for the bass channels. The current single power supplies sound insufficient during heavy music passages.
b) Using 15H/10H chokes instead of 5H. + 100uf filter capacitor for bass channel.
c) Use JJ 2a3-40W tube for bass, bias at 260v, 80mA. I feel I needed more power for bass during initial listening
d) Hashimoto Output Transformer H203-S for Highs/Mid and Lundahl LL1623 for bass. I have these.
e) Using DC heated supplies (IC regulated) for 6sn7 and 2a3 only for the bass channel. If the results is good, I might use this for the mid/highs too. Hum is currently at 4-5mV measured at woofer. 2mV at Twt and Mids. Should I use DC heated supplies for mid/highs too?
e) changing the crossover points to 400 Hz and 4KHz. Somehow, I feel that the Raven R-2 sonic signature is too different to the PHL and a higher crossover point may help the sound. Is this a good choice? Or I should drop the Raven and use a dome tweeter like Seas Millenium?
This is my first diy tube amplifier attempt and 2nd DIY loudspeaker (The first Pine wood based speaker resonates
so I dropped it ) so any suggestions to a newcomer to this hobby are appreciated!
Thanks!
Marcus Tan
I built a carbon fiber laminated MDF loudspeaker using Raven R2-PHL 1120 and PHL 3003 drivers. The active crossover is an audio-kit crossover at 300Hz and 2.5Khz
http://www.audio-kits.com/catalog/item/4071180/3884480.htm
I build 3 channels of Sun Audio sv2a3 based SET (using a single power supply) to power one single speaker for testing. This is a simple 6sn7 cascade - 2a3 design. The sound is good and I am looking for suggestions on how to optimize my second build. Based on the initial listening, I am thinking of making the following modifications:
a) Separate power supplies for the bass channels. The current single power supplies sound insufficient during heavy music passages.
b) Using 15H/10H chokes instead of 5H. + 100uf filter capacitor for bass channel.
c) Use JJ 2a3-40W tube for bass, bias at 260v, 80mA. I feel I needed more power for bass during initial listening
d) Hashimoto Output Transformer H203-S for Highs/Mid and Lundahl LL1623 for bass. I have these.
e) Using DC heated supplies (IC regulated) for 6sn7 and 2a3 only for the bass channel. If the results is good, I might use this for the mid/highs too. Hum is currently at 4-5mV measured at woofer. 2mV at Twt and Mids. Should I use DC heated supplies for mid/highs too?
e) changing the crossover points to 400 Hz and 4KHz. Somehow, I feel that the Raven R-2 sonic signature is too different to the PHL and a higher crossover point may help the sound. Is this a good choice? Or I should drop the Raven and use a dome tweeter like Seas Millenium?
This is my first diy tube amplifier attempt and 2nd DIY loudspeaker (The first Pine wood based speaker resonates
Thanks!
Marcus Tan