Post by nunonaos on Sept 22, 2017 18:34:24 GMT
Ora bem, andava com uma certa vontade de tentar construir um amp a válvulas, e depois de ver que o alribas se atirou e recomendou, ganhei coragem e atirei-me para um kit.
Diz a lógica que devia ter ido para algo bem mais simples, estive quase para mandar vir um kit baseado no tweed champ mas não era bem o que queria.
O que queria era um princeton reverb, mas esse também era muito caro! ficava perto de 700€...
Portanto decidi ir para este kit da tube-town:
www.tube-town.net/ttstore/Kits/Verstaerker/TT-Kit-5Ae3::7893.html
www.tube-town.net/cms/?DIY/Amps/TT_5Ae3_%28engl%29
Quem quiser consultar a página do projeto pode ver a descrição, mas é basicamente um tweed deluxe com algumas mods:
a) Separate cathode resistors at the first double triode for normal and bright channels, the channels can get voiced differently and independently.
b) The normal channel has been expanded with a switchable tonestack which gets activated by a push-pull potentiometer. This allows versatile settings and greatly enhances the sound spectrum, it allows to realize some “cleaner” amp sounds.
c) Negative feedback, switchable via a push-pull potentiometer. Often desired, especially when effects are used in front of the amp. When engaged the output stage offers a "more controlled" sound.
d) A pentode/triode switch has been added. In addition to the lower output power in triode mode, there are also sound differences between the pentode (normal case) and triode operation. Slightly different voicings of the overdrive behaviour can also be heard.
e) Cathode bias / fixed bias switchable, with an additional bias setting trimmer on the PCB. A request from some forum members. The basic effect is partly similar to the NFB or the pentode/triode mode. The amp sounds a bit “tighter” when overdriven.
f) Master Volume. Should be self-explanatory.
g) Partially Coupling capacitors with lower capacities for a more controlled bass range. This measure serves primarily to tighten the bass reproduction and also reduces blocking distortion.
h) Gridstopper/voltage divider before the cathodyn phase inverter to avoid unpleasant distortion when the amp gets cranked. Also a known problem of the 5E3 at higher volume levels which gets thereby (almost) eliminated.
Ora, terminei hoje as soldas, ainda estou a fazer alguns testes para ver se tenho algum erro e por isso ainda não o liguei para ver quanto tempo demora a explodir...
Para já só posso deixar umas fotos:
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Diz a lógica que devia ter ido para algo bem mais simples, estive quase para mandar vir um kit baseado no tweed champ mas não era bem o que queria.
O que queria era um princeton reverb, mas esse também era muito caro! ficava perto de 700€...
Portanto decidi ir para este kit da tube-town:
www.tube-town.net/ttstore/Kits/Verstaerker/TT-Kit-5Ae3::7893.html
www.tube-town.net/cms/?DIY/Amps/TT_5Ae3_%28engl%29
Quem quiser consultar a página do projeto pode ver a descrição, mas é basicamente um tweed deluxe com algumas mods:
a) Separate cathode resistors at the first double triode for normal and bright channels, the channels can get voiced differently and independently.
b) The normal channel has been expanded with a switchable tonestack which gets activated by a push-pull potentiometer. This allows versatile settings and greatly enhances the sound spectrum, it allows to realize some “cleaner” amp sounds.
c) Negative feedback, switchable via a push-pull potentiometer. Often desired, especially when effects are used in front of the amp. When engaged the output stage offers a "more controlled" sound.
d) A pentode/triode switch has been added. In addition to the lower output power in triode mode, there are also sound differences between the pentode (normal case) and triode operation. Slightly different voicings of the overdrive behaviour can also be heard.
e) Cathode bias / fixed bias switchable, with an additional bias setting trimmer on the PCB. A request from some forum members. The basic effect is partly similar to the NFB or the pentode/triode mode. The amp sounds a bit “tighter” when overdriven.
f) Master Volume. Should be self-explanatory.
g) Partially Coupling capacitors with lower capacities for a more controlled bass range. This measure serves primarily to tighten the bass reproduction and also reduces blocking distortion.
h) Gridstopper/voltage divider before the cathodyn phase inverter to avoid unpleasant distortion when the amp gets cranked. Also a known problem of the 5E3 at higher volume levels which gets thereby (almost) eliminated.
Ora, terminei hoje as soldas, ainda estou a fazer alguns testes para ver se tenho algum erro e por isso ainda não o liguei para ver quanto tempo demora a explodir...
Para já só posso deixar umas fotos:
