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Old 26th May 2013, 12:19 AM   #21
Sprags is offline Sprags  United States
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Well from everyone's suggestions here on the forum my plan is the start out building the 12Vac preamp with an 18Vac Wallwart preamp to start. I'm also going to use the chassis John Broskie shows in the article that comes from mouser to keep things as simple as possible. Eventually though I really think the 5687 kit is what I really want.

Prior to finding this forum I planned on buying the VTA ST-70 amplifier kit to build and have as part of a stereo for my home office. I think what I'd do is then use the 12 Vac kit preamp as part of that system for my home office and then have my VTA ST-120 amp and the 5687 kit preamp as my system for the living room.

But...before I get ahead of myself I'm going to stay focused on the 12 Vac kit. To keep things as simple for as possible I will purchase all of the components from the Glassware web site other than the chassis, power supply and selector switch since he seems to be out of them. I'll either try to hunt one down elsewhere unless he tells me they will be in stock soon (I've already sent him a message). At this time I still have a few questions though. John Broskie offers choices for resistor/capacitor sets in 2 different parts of the online ordering form. Being new...I have no idea which is a better choice...other than that he has 2 sets for a 12Vac PS and 2 sets for the 18 Vac PS. Can someone tell me what the differences would be between the 1% and 5% choice and also the choices about the different dB levels? The price differences aren't that much different, if at all.

My guess is that it depends on what type of sound sources I'll be using and perhaps what kind of amp I have. Right now I have a Marantz CD5004 CD player and a Marantz ST6000 tuner. I'm not planning on going to anything more expensive than these. I also ave a Sony CD player. I know ..it's not the best but it is fairly new and in really good condition. I have Polk Audio LSiM 703 speakers that I am really happy with. They're ratted at 88 dB so they aren't the most efficient but they aren't bad...and they do sound really nice in my opinion.

So...any suggestions? Thank again....Blake
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Old 26th May 2013, 12:26 AM   #22
Einric is offline Einric  United States
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Go with the 1% resistor kit.
Why 18V wallwart and not the 12V with the 6DJ8 tubes?
A lot of people really like the 6DJ8 from what I've read.
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Old 26th May 2013, 12:31 AM   #23
Sprags is offline Sprags  United States
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I have a bunch of 12AU7 tubes. I thought from the article those sound better than the 6DJ8 tubes. If not I don't have a problem with going with that option. Any feedback or suggestions is appreciated.

The amp I have uses the 12AU7's as well as KT88's as output tubes. I thought it would help keep what need in inventory down as well.
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Old 26th May 2013, 12:36 AM   #24
Einric is offline Einric  United States
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Use what ya got man!
They are both fine tubes.
The 18V transformer should cost about the same.
Are you going to go with a wallwart or an internal transformer?
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Old 26th May 2013, 12:43 AM   #25
Sprags is offline Sprags  United States
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Well...to be honest I think I'd really prefer an internal toroidal transformer but thought to keep things simple I should stick with a Wallwart.

Any help on the resistors and capacitor choices from the Glassware website?
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Old 26th May 2013, 03:50 AM   #26
Einric is offline Einric  United States
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Go with the 1% Metal Film Kit.
If you really want to go classic then get the 5% carbon film.

I like the 1% Metal Film because of the higher precision.

One of these days I may get a wild hair up my butt and hand match 1% tolerant carbon films to change out in my Aikido.
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Old 26th May 2013, 04:16 AM   #27
Sprags is offline Sprags  United States
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Quote:
Originally Posted by Einric View Post
Go with the 1% resistor kit.
Why 18V wallwart and not the 12V with the 6DJ8 tubes?
A lot of people really like the 6DJ8 from what I've read.
After you asking that question I think I just might give the 6DJ8's a try. From the description on the Glassware site it says the E88CC tube can be used. I keep seeing that's a low noise tube. That kinda peaks my interest. On the selection part of the order form there is a choice of resistor packs and the differences it offers are -1, -1.5 and -2 dB. Can you tell me what those choices mean? Of course those too are offered on 1% and 5% also and I'd choose the 1% from your previous suggestion. Now I need to know what the - decibel levels mean.

As usual...thanks for your patience and tolerance for walking me through this project...Blake
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Old 26th May 2013, 04:32 AM   #28
Einric is offline Einric  United States
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The DB level is for the volume and balance controller.
I'd do without that part and use an Alps Blue Velvet or TKD pot.

However....John's mini stepper A-3 Balance/Volume has peaked my interest lateley, I'd go with 2db increments.
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Old 26th May 2013, 04:33 AM   #29
Einric is offline Einric  United States
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The 6922 is also another "premium" variant on the 6DJ8.
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Old 26th May 2013, 06:55 AM   #30
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Quote:
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The 6922 is also another "premium" variant on the 6DJ8.
Yes, and if one likes to tube-roll the russian 6N23P-EV can be used directly without any changes in the circuit. The EV-edition is the premium type of 6N23P - aka 6922 and E88CC. Please note that this is one of the few russian tubes which doesn´t need a higher heater current than its western cousin.
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