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In Reply to: RE: Advice on getting a 45 built posted by Frihed89 on December 16, 2014 at 11:59:33
Thanks Frihed89
So I'm having someone build this for me but not by a 'reputable' builder as my budget doesn't allow it. Anyways I think I found my guy. He is just more affordable than any of these other options including Don. I heard a Jeff Larson 2A3 and that's how I fell in love with the set sound. I might just go with the knockoff yammi and see what I think and take it from there.
Here's a trick question, a cap coupled 45 like the yammi vs a direct coupled loften white 2a3 like Don's?
Follow Ups:
The two stage direct coupled Type 45 amp should be superior to a two stage cap coupled A-08S.
Two reasons :
( 1) The direct couple is simpler, superior to a cap couple.
(2) A triode driver tube is simpler, superior, to a pentode driver tube.
Be sure the DC amp uses a mu of 100 driver tube.
Why a Mu of 100 rather than Mu of 35 or 70? Even a mu of 35 will drive the amp to full output.
Thanks drlowmu
2 Q's
A- Will using a triode driver tube result in less gain? Any negatives of going this route?
B- Will a triode driver tube build be more costly than using a pentode driver tube?
Cheers~
Not if you use a high mu ( high gain, gain of 100 ) triode, as is often done since 1947 in better L-Ws.
( eg : 6SF5, 1/2 of a 12AX7, 7B4s, etc ). All triodes, simple linear.
The Pentode takes more parts to implement.
something like the 6SF5 single triode driver ?
Yes, that driver tube is what Robin and Lipman published in 1947, 6SF5 DCed into a 6B4G. .
Better driver tube choice is 1/2 a 12AX7, it is plentiful, so you can "tube roll" ( Telefunken smooth plates, Amperex, Mullard, etc etc etc. )
Additionaly, I discovered in 2014 that higher mu triodes that are octal based ( 6SF5, 6SL7 ) SUFFER slightly, just from having eight soldered connections, to the Octal pins, that is HEARD as a degrade in ultimate clarity and resolution, compared to a more modern 9 pin miniature triode. Diction suffers, ultimate resolution suffers on voice.
I have A-Bed this. With the better tube-type choice, its extra clarity for free, IF you are conscious to make the best tube choice decisions at the onset. You can sub 1/2 a 12AX7 for a 6SF5, not any problem what so ever.
If you contact me privately, via email, I can send you information and suggestions to directly apply to your Type 45 build, …..IF… you elect to do a DC amp. I can even refer you to others using Type 45s, I have helped.
Its not "for peanuts" that you build an amp, but I am an amateur and I advise for free. I know I can provide you the best bang for the buck in performance suggestions, that will fit within your tight budget. I have enough experience to do that.
Jeff Medwin ..... email address above
actually I just looked on the original schematic from 97 and Tucker used the Medium Mu twin triode 5965
I do NOT wanna critique Messers. Tucker, Garber, Uthus on a public forum. Lets do an email discussion !!!Jeff Medwin
Edits: 12/17/14
Hi Jeff
Sounds good I would love you hear your experienced thoughts and don't want this to turn in to an emotional forum debate so I will contact you by email. What is your email address?
Cheers~
Click on my Moniker, ( drlowmu ) and it leads to email address .
Jeff Medwin
I really like my Fi Amps. I haven't heard the Yamamoto. I have heard a lot of cap coupled 300B, 2A3 and 45 amps. I have owned 2 cap-coupled 300B amps and a 2A3 headphone amp and enjoy(ed) them all. I still have one of each.
It's all in the design and parts, either way. I am particularly struck by the need for excellent OPTs. I've already upgraded my Fi OPTs and will do more when I have the money. My Audio Note 300B amp already has double C-Core Hi-B transformers, not the best, but quite a bit better than the standard cores.
So, I'm going to beg off.
Good luck.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
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