Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: hesamadman on January 06, 2014, 08:56:42 am
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I made a mistake in my post yesterday. The values that I am having a hard time finding are..
.005 (would .0047 be acceptable. I mean its within the tolerance so I would assume as much)
.05 (.047???)
.03 (.027??? Only issue here is all I can find is 100v rating. The .03 cap is coming off pin 6 of the tremolo 12ax7 on the gretsch 6151 I am building. The 100v should be fine here right?)
It also calls for a 10-10-20 cap can. I am looking for the most economical way to do this. But All I can find are 10uf on hoffman for 10 a piece and the 20uf is $17. $37 for these filter caps :/ I have to cut cost down on this little guy. Sheeesh….shes getting expensive for a 5 watter :icon_biggrin:
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I was hoping to find some cheaper lower values to put in parallel to achieve the proper UF. I don't know if this is acceptable but that was the first thing that popped in my head. :think1:
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.005 (would .0047 be acceptable.)
yes
.05 (.047???)
yes
.03 (.027??? Only issue here is all I can find is 100v rating. The .03 cap is coming off pin 6 of the tremolo 12ax7 on the gretsch 6151 I am building. The 100v should be fine here right?)
No. Doug has a .033 @ 600v. Use that.
It also calls for a 10-10-20 cap can. I am looking for the most economical way to do this. But All I can find are 10uf on hoffman for 10 a piece and the 20uf is $17. $37 for these filter caps :/ I have to cut cost down on this little guy.
Don't buy expensive Atoms. Go to AES and get some Illinois brand 10s and use a 22 for the 20.
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.005 (would .0047 be acceptable.)
yes
.05 (.047???)
yes
.03 (.027??? Only issue here is all I can find is 100v rating. The .03 cap is coming off pin 6 of the tremolo 12ax7 on the gretsch 6151 I am building. The 100v should be fine here right?)
No. Doug has a .033 @ 600v. Use that.
It also calls for a 10-10-20 cap can. I am looking for the most economical way to do this. But All I can find are 10uf on hoffman for 10 a piece and the 20uf is $17. $37 for these filter caps :/ I have to cut cost down on this little guy.
Don't buy expensive Atoms. Go to AES and get some Illinois brand 10s and use a 22 for the 20.
Sluckey………………………… :occasion14: You the man!!! Thats root beer in those mugs I don't drink :icon_biggrin:
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Should I just get all 10's and put two together for my 20? They didn't have 20 but had a 22. In the Illinois that is.
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like I said, use a 22
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like I said, use a 22
:BangHead: Sorry Sluckey…..scatterbrained and I somehow missed that.
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Sluckeys right but if your making your own eyelet/turret board or are using terminal strips/solder lug strips you could use radial filter caps. 22uF@450v, high temp, high ripple, long life (Endurance: 105 °C 8000 h to 10000 h), small size > $1.67 for 1 to 9, $1.14 for 10 to 99.
http://www.mouser.com/ProductDetail/Panasonic/EEU-EE2W220S/?qs=sGAEpiMZZMtZ1n0r9vR22dN7zJS18SGVPwHDeJcuj2Q%3d (http://www.mouser.com/ProductDetail/Panasonic/EEU-EE2W220S/?qs=sGAEpiMZZMtZ1n0r9vR22dN7zJS18SGVPwHDeJcuj2Q%3d)
Brad :icon_biggrin:
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I also have a cap labeled like this 35/50 Is this a 35uf 50v cap. I think this is the cathode bypass cap on the first pre amp tube?
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If it only has 2 leads (not 3 coming) out of the cap then yes it should be 35uF@50v.
Although if it was a dual cap in a single can (3 leads) it would have a 3rd number on it.
Brad :icon_biggrin:
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If it only has 2 leads (not 3 coming) out of the cap then yes it should be 35uF@50v.
Although if it was a dual cap in a single can (3 leads) it would have a 3rd number on it.
Brad :icon_biggrin:
Looks like just a standard 2 lead.
(http://i89.photobucket.com/albums/k205/fratbasher/capquestion.jpg) (http://s89.photobucket.com/user/fratbasher/media/capquestion.jpg.html)
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in which I found http://www.mouser.com/ProductDetail/Vishay-Sprague/TE1306-E3/?qs=sGAEpiMZZMukHu%252bjC5l7YT5hGfLd1pQxshTdqcp1s8w%3d (http://www.mouser.com/ProductDetail/Vishay-Sprague/TE1306-E3/?qs=sGAEpiMZZMukHu%252bjC5l7YT5hGfLd1pQxshTdqcp1s8w%3d)
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Yep, you have it right.
Brad :icon_biggrin:
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I also have a cap labeled like this 35/50 Is this a 35uf 50v cap. I think this is the cathode bypass cap on the first pre amp tube?
It's your money, but getting the 50v rated part is just silly. You will never have a voltage close to that in that point of the circuit (even with the trem in place).
In reality, that cap will only need to be able to withstand a couple volts, but the smallest common voltage rating is 6.3vdc. Higher voltages (like 10-25v) will be more common and cheaper.
See, you're getting caught by changes over time in how parts are rated (10-20-25-50 vs. 10-22-33-47-68) and in commonly available voltage ratings (which are now largely driven by transistor/IC electronics, then by whatever other demand there is).
Get as reasonably close as you can (over or under) on uF rating, and try to get same or over on voltage rating (which you seem to be doing well). Ask on any part that's several-dollars, as some (like this bypass cap) don't need the schematic value (it was likely 35v originally because of availability back when the amp was brand-new).