I did. I used all Sovtek WAs and 1 WB in my 36W Trem TMB. I'm gonna try and finally record a demo with it this weekend. Cryoset TungSol EL34s for the power tubes. I don't usually buy into the cryo stuff, but I had a pair in my tube stash.
Filmosound 18Watt conversion, Help!
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Re: Filmosound 18Watt conversion, Help!
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Re: Filmosound 18Watt conversion, Help!
Hi-fi builders use the EL84M to sub for the 7189, which is an up-rated EL84. Not sure I have a good copy of the exact specs, but a pair of 7189 can output 24W. I think the EL84M is probably the most reliable variant available at this time.Bieworm wrote: ↑Sat 03/27/21 7:39 amI don't use them for V1 or V2. But they rule as reverb tube. The EL84 M is a really rugged tube. It's a real difference in glass thickness too..JMPGuitars wrote: ↑Sat 03/27/21 7:06 amThe Sovteks? Sovteks are better than JJ, but I haven't personally tried their EL84 varieties. I was pleasantly surprised by their 7025 series 12AX7WA and WB tubes. Their regular 12AX7s aren't exciting, but still better than JJ. I haven't A/B'd them with anything else though.TriodeLuvr wrote: ↑Fri 03/26/21 11:39 pmI've heard good things about the EL84M, available directly from eastern Europe. Not as cheap as they used to be though.
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Re: Filmosound 18Watt conversion, Help!
To my ears the EHX 12ax7 is the nicer V1. I actually like the sound of a JJ ECC83S but I just don't trust them anymore...JMPGuitars wrote: ↑Sat 03/27/21 11:14 amI did. I used all Sovtek WAs and 1 WB in my 36W Trem TMB. I'm gonna try and finally record a demo with it this weekend. Cryoset TungSol EL34s for the power tubes. I don't usually buy into the cryo stuff, but I had a pair in my tube stash.
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Re: Filmosound 18Watt conversion, Help!
I'm as an experiment, I've ordered some 6P14P mil spec soviet made tubes from ebay.
8 for $20, gives me spares in case. First bit of reading, some claim that they are what the tube store label their preferred 7189s?
It gives me spares, which is what I'm missing.
As a back up if the 6P14P sound terrible a set of Tung Sol new production from the Tube Store, I needed some other parts, so I thought I'd try these as well.
In the mean time, I checked with a meter, I'm not getting any shorts between pins on the output sockets, looks like it was just the tube going bad, crap.
8 for $20, gives me spares in case. First bit of reading, some claim that they are what the tube store label their preferred 7189s?
It gives me spares, which is what I'm missing.
As a back up if the 6P14P sound terrible a set of Tung Sol new production from the Tube Store, I needed some other parts, so I thought I'd try these as well.
In the mean time, I checked with a meter, I'm not getting any shorts between pins on the output sockets, looks like it was just the tube going bad, crap.
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Re: Filmosound 18Watt conversion, Help!
Mullard's probably my favorite, followed by Tung Sol. I don't know where these Sovteks rank yet (to me), and I haven't tried the EHX in a while, though I think I have an EHX 7025 in my stash. Maybe on the next build I try some V1 tube swapping and see what sounds best.
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Re: Filmosound 18Watt conversion, Help!
The audio guys say the 6P14P is a good choice, suitable for anode voltages up to at least +400V. A number of them have also apparently used it to replace the 7189. Just have to be sure not to exceed the 12W anode rating. Wow, $2.50 each?? I might have to buy some myself, just to keep around.LeifH wrote: ↑Sat 03/27/21 1:01 pmI'm as an experiment, I've ordered some 6P14P mil spec soviet made tubes from ebay.
8 for $20, gives me spares in case. First bit of reading, some claim that they are what the tube store label their preferred 7189s?
It gives me spares, which is what I'm missing.
As a back up if the 6P14P sound terrible a set of Tung Sol new production from the Tube Store, I needed some other parts, so I thought I'd try these as well.
In the mean time, I checked with a meter, I'm not getting any shorts between pins on the output sockets, looks like it was just the tube going bad, crap.
Jack
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Re: Filmosound 18Watt conversion, Help!
I have those 6p14p too on my 18 watts. One pair has gone microphonic... not bad, but rattly a little... so there goes military spec BS... they sound great though.. really greatLeifH wrote: ↑Sat 03/27/21 1:01 pmI'm as an experiment, I've ordered some 6P14P mil spec soviet made tubes from ebay.
8 for $20, gives me spares in case. First bit of reading, some claim that they are what the tube store label their preferred 7189s?
It gives me spares, which is what I'm missing.
As a back up if the 6P14P sound terrible a set of Tung Sol new production from the Tube Store, I needed some other parts, so I thought I'd try these as well.
In the mean time, I checked with a meter, I'm not getting any shorts between pins on the output sockets, looks like it was just the tube going bad, crap.
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Re: Filmosound 18Watt conversion, Help!
LMAOBieworm wrote: ↑Sat 03/27/21 3:25 pmI have those 6p14p too on my 18 watts. One pair has gone microphonic... not bad, but rattly a little... so there goes military spec BS... they sound great though.. really greatLeifH wrote: ↑Sat 03/27/21 1:01 pmI'm as an experiment, I've ordered some 6P14P mil spec soviet made tubes from ebay.
8 for $20, gives me spares in case. First bit of reading, some claim that they are what the tube store label their preferred 7189s?
It gives me spares, which is what I'm missing.
As a back up if the 6P14P sound terrible a set of Tung Sol new production from the Tube Store, I needed some other parts, so I thought I'd try these as well.
In the mean time, I checked with a meter, I'm not getting any shorts between pins on the output sockets, looks like it was just the tube going bad, crap.
I guess the mil spec should have the accompanying binder with the name of the janitor who cleaned up before and after production as well as the days lunch menu.
Or it was made on a Wednesday ?
Thanks to all for the input, hope to have tubes by Wednesday, I would like my next post to be a clip of the wee beast in action.
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Re: Filmosound 18Watt conversion, Help!
I got the new tubes from the Tube Store today.
As I'm now a little paranoid about this. I had added screen resistors to my 5E3 when I built it on what seemed like everyone's recommendation as a little protection and to limit blocking distortion.
Is this a good idea on the lite iib? And, what size and wattage are preferred?
Again, thanks.
As I'm now a little paranoid about this. I had added screen resistors to my 5E3 when I built it on what seemed like everyone's recommendation as a little protection and to limit blocking distortion.
Is this a good idea on the lite iib? And, what size and wattage are preferred?
Again, thanks.
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Re: Filmosound 18Watt conversion, Help!
The lite 2b already has screen resistors. If you're following my docs: files/JMPGuitars_18_Watt_Lite_2b_Schematic.pdfLeifH wrote: ↑Wed 03/31/21 5:08 pmI got the new tubes from the Tube Store today.
As I'm now a little paranoid about this. I had added screen resistors to my 5E3 when I built it on what seemed like everyone's recommendation as a little protection and to limit blocking distortion.
Is this a good idea on the lite iib? And, what size and wattage are preferred?
Again, thanks.
...then it is sharing a 1K 3W screen resistor. You could use 2 separate 1K 3W resistors instead if you prefer.
The old doc versions had 100Ω screen resistors, but they should really be 1K.
Thanks,
Josh
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Re: Filmosound 18Watt conversion, Help!
Thanks Josh, I'm not good at my words today.JMPGuitars wrote: ↑Wed 03/31/21 5:30 pmThe lite 2b already has screen resistors. If you're following my docs: files/JMPGuitars_18_Watt_Lite_2b_Schematic.pdfLeifH wrote: ↑Wed 03/31/21 5:08 pmI got the new tubes from the Tube Store today.
As I'm now a little paranoid about this. I had added screen resistors to my 5E3 when I built it on what seemed like everyone's recommendation as a little protection and to limit blocking distortion.
Is this a good idea on the lite iib? And, what size and wattage are preferred?
Again, thanks.
...then it is sharing a 1K 3W screen resistor. You could use 2 separate 1K 3W resistors instead if you prefer.
The old doc versions had 100Ω screen resistors, but they should really be 1K.
Thanks,
Josh
Yes, I meant individual, for each tube. And does that provide better protection as well as blocking the isolation?
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Re: Filmosound 18Watt conversion, Help!
Words are hard sometimes, I hear ya.
It's maybe better protection. Like if a resistor fails, then only one of the tubes will be directly affected, but I've never actually had that happen. I don't know what you mean by "blocking the isolation." I wouldn't overthink it. Either use two or use one, as long as you use 1K 3W, you're good.
Thanks,
Josh
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Re: Filmosound 18Watt conversion, Help!
Sorry, that time I swear it was my stupidity. Not auto correct.
When I built my 5E3, as I recall, I was advised to put individual resistors on each tube to both prevent blocking distortion and help protect the tubes from each other. What i meant by isolation.
I wasn't sure about just one shared resistor both protecting the screens and helping to prevent blocking distortion.
I thought the blocking distortion was one tube pushing when it was supposed to be pulling or vice versa, ( out of phase) into the other tube via the screens?
When I built my 5E3, as I recall, I was advised to put individual resistors on each tube to both prevent blocking distortion and help protect the tubes from each other. What i meant by isolation.
I wasn't sure about just one shared resistor both protecting the screens and helping to prevent blocking distortion.
I thought the blocking distortion was one tube pushing when it was supposed to be pulling or vice versa, ( out of phase) into the other tube via the screens?
0 x
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Re: Filmosound 18Watt conversion, Help!
the maestro: https://www.aikenamps.com/index.php/wha ... distortionLeifH wrote: ↑Thu 04/01/21 6:00 pmSorry, that time I swear it was my stupidity. Not auto correct.
When I built my 5E3, as I recall, I was advised to put individual resistors on each tube to both prevent blocking distortion and help protect the tubes from each other. What i meant by isolation.
I wasn't sure about just one shared resistor both protecting the screens and helping to prevent blocking distortion.
I thought the blocking distortion was one tube pushing when it was supposed to be pulling or vice versa, ( out of phase) into the other tube via the screens?
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Re: Filmosound 18Watt conversion, Help!
He sure is, that was an explanation and a half. Thanks!JMPGuitars wrote: ↑Thu 04/01/21 6:08 pmthe maestro: https://www.aikenamps.com/index.php/wha ... distortionLeifH wrote: ↑Thu 04/01/21 6:00 pmSorry, that time I swear it was my stupidity. Not auto correct.
When I built my 5E3, as I recall, I was advised to put individual resistors on each tube to both prevent blocking distortion and help protect the tubes from each other. What i meant by isolation.
I wasn't sure about just one shared resistor both protecting the screens and helping to prevent blocking distortion.
I thought the blocking distortion was one tube pushing when it was supposed to be pulling or vice versa, ( out of phase) into the other tube via the screens?
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Re: Filmosound 18Watt conversion, Help!
As an update, i received the NOS 6P14P and installed them. To my ear, and at lower volume it's running well. The 6P14P seem less chimey than the Tung-Sol's.
They sound good, more creamy.
Again, its in an apartment. Sadly, we've been in lockdown for the past month now, so going to the cottage to crank this up, ot getting to a jam hasn't happened.
Thanks to you the community for your help!
I can't wait to get this turned up beyond almost 2!
They sound good, more creamy.
Again, its in an apartment. Sadly, we've been in lockdown for the past month now, so going to the cottage to crank this up, ot getting to a jam hasn't happened.
Thanks to you the community for your help!
I can't wait to get this turned up beyond almost 2!
2 x
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Re: Filmosound 18Watt conversion, Help!
Leif... hope you're not expecting Mil Spec from these 6P14P tubes.. I already ahve a pair rattling at higher volume.. even with dampening rings.LeifH wrote: ↑Sun 05/09/21 5:24 pmAs an update, i received the NOS 6P14P and installed them. To my ear, and at lower volume it's running well. The 6P14P seem less chimey than the Tung-Sol's.
They sound good, more creamy.
Again, its in an apartment. Sadly, we've been in lockdown for the past month now, so going to the cottage to crank this up, ot getting to a jam hasn't happened.
Thanks to you the community for your help!
I can't wait to get this turned up beyond almost 2!
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Re: Filmosound 18Watt conversion, Help!
The screen resistor arrangement is quite irrelevant to blocking distortion. The series resistor on the signal grid (g1) is intended to help with that.LeifH wrote: ↑Sat 04/03/21 5:52 pmHe sure is, that was an explanation and a half. Thanks!JMPGuitars wrote: ↑Thu 04/01/21 6:08 pmthe maestro: https://www.aikenamps.com/index.php/wha ... distortionLeifH wrote: ↑Thu 04/01/21 6:00 pmSorry, that time I swear it was my stupidity. Not auto correct.
When I built my 5E3, as I recall, I was advised to put individual resistors on each tube to both prevent blocking distortion and help protect the tubes from each other. What i meant by isolation.
I wasn't sure about just one shared resistor both protecting the screens and helping to prevent blocking distortion.
I thought the blocking distortion was one tube pushing when it was supposed to be pulling or vice versa, ( out of phase) into the other tube via the screens?
Apart from that, I usually have the screen grids fed by individual 100 ohm resistors fed from a shared 1k resistor.
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