Yeah, I will build my own B+ supply.
Could you guys make more recommendations on specific model for filament supply ?
Variable voltage from 2.5 to 20V would be nice.
Could you guys make more recommendations on specific model for filament supply ?
Variable voltage from 2.5 to 20V would be nice.
Samething, get a 10-0-10 tranny, rectify, filter and put it through a voltage reg. Use a trim pot to set voltage on the adjust pin of the reg like a lm317
I've got a Tenma 72-7245. It's dual out (0-30V up to 3A each side) and the two outputs can be put in series (for 0-60V @ up to 3A) or parallel (for 0-30V @ up to 6A) at the flip of a switch. Separate voltage and current regulation (so you can current limit the heater supply and keep a cold filament from drawing too much) and displays.
An externally hosted image should be here but it was not working when we last tested it.
I use one side for heater and the other for bias.
I used an ELC - (forget the model #) - where I used to work; pretty much the same animal 'cept you had to switch the display from volts to amps for each side. I kinda like being able to see both at once though.
Never had a lick of trouble with either of them.
Of course, there's always the "industry standards": HP Agilent, Fluke, and Tektronix.
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Oh! if price was no object, I'd jump for one of these...
Lambda 71 0 500V Tube Audio Power Amplifier Variable Regulated 300B B DC Supply | eBay
Lambda 71 0 500V Tube Audio Power Amplifier Variable Regulated 300B B DC Supply | eBay
That product is worth more than 689 USD, just a price of good/average Chinese tube amplifier.
Look what is inside and how it has been constructed.
Look what is inside and how it has been constructed.
If price is no object, I would suggest this instead:
An externally hosted image should be here but it was not working when we last tested it.
GENH600-1.3 (600V 1.3A)
If you can find a used one, it costs about the same as the old unit on eBay.
Genesys(TM) 1U 750W Half Rack Programmable DC Power Supplies from TDK-Lambda Americas
This (plus two lower voltage units) is replacing my DIY supply 😀
Pete
Personally i would recommend a 0-300 volt 100mA CC CV power supply. if you can get two of these for series use: Do it!
I have a Delta Elektronica E300-0.1 that i use as a bench power supply. works really well.
In the States you might have a better chance finding a HP 6209B.
For the filaments i would look for a HP 6281 I have good experience whit that model. It does 0-7.5 volts and 0-5A
seriously, you should buy good equipment. the price now is high but you'll likely won't regret it.
if you can't get the said types. look for brands like sorensen, Lambda or the old discrete powered Harrison (HP) supplies.
Regards.
V4lve
I have a Delta Elektronica E300-0.1 that i use as a bench power supply. works really well.
In the States you might have a better chance finding a HP 6209B.
For the filaments i would look for a HP 6281 I have good experience whit that model. It does 0-7.5 volts and 0-5A
seriously, you should buy good equipment. the price now is high but you'll likely won't regret it.
if you can't get the said types. look for brands like sorensen, Lambda or the old discrete powered Harrison (HP) supplies.
Regards.
V4lve
Hello Pete- I am busy collecting parts for your DIY power supply but haven't start a build as yet - pls let me know if you plan to dispose of your DIY supply.
No comments on low-voltage filament supplies.
They're a dime a dozen.
However, there ARE some interesting high and even higher voltage power-supplies to be had.
I have a HP 6209B (~1990) in mint condition.
Rated for 0-320V at 0.1A
Pretty nifty for a G2-supply.
Set me back €200.
The seller had 2 and I bought only one.
Had to pick it up in Holland 😀
I also have a HP E3612A (~1999)
Rated for 0-120V at 0.25A.
Fits the fixed-bias supply requirements perfect. Well, maybe overkill 😀
That one was $175,-
Then I have something very potent for B+
Also something VERY dangerous to use if you don't know your way around it.
What I'm talking about is an Electrofocusing (Elektrophoresis) Power-supply.
LKB-2197 (~1985) rated at 10-2500V at 0.25A (100Watt Max)
The good thing is that it was $100,- in near-mint condition.
It took 3 Bourns 10-turn pot's to make it mint.
The downside is that you have to be very, very focused on using it safely.
The output is floating and not referenced to the case meaning that YOU SHOULD NOT let the case touch any other instrument-case and YOU SHOULD NOT touch anything else when adjusting the B+
The case is always at half of B+
Now you're warned.
All of the above can be found on eBay regularly at similar prices.
Expensive? I don't think so. You'll not be able to build something like this for less imo.
rgds,
/tri-comp
They're a dime a dozen.
However, there ARE some interesting high and even higher voltage power-supplies to be had.
I have a HP 6209B (~1990) in mint condition.
Rated for 0-320V at 0.1A
Pretty nifty for a G2-supply.
Set me back €200.
The seller had 2 and I bought only one.
Had to pick it up in Holland 😀
I also have a HP E3612A (~1999)
Rated for 0-120V at 0.25A.
Fits the fixed-bias supply requirements perfect. Well, maybe overkill 😀
That one was $175,-
Then I have something very potent for B+
Also something VERY dangerous to use if you don't know your way around it.
What I'm talking about is an Electrofocusing (Elektrophoresis) Power-supply.
LKB-2197 (~1985) rated at 10-2500V at 0.25A (100Watt Max)
The good thing is that it was $100,- in near-mint condition.
It took 3 Bourns 10-turn pot's to make it mint.
The downside is that you have to be very, very focused on using it safely.
The output is floating and not referenced to the case meaning that YOU SHOULD NOT let the case touch any other instrument-case and YOU SHOULD NOT touch anything else when adjusting the B+
The case is always at half of B+
Now you're warned.
All of the above can be found on eBay regularly at similar prices.
Expensive? I don't think so. You'll not be able to build something like this for less imo.
rgds,
/tri-comp
Thank you guys for the input.
I plan to buy instead of build now.
The HP 6209B and 6281A seem good.
Pete's recommendation is very expensive.
I plan to buy instead of build now.
The HP 6209B and 6281A seem good.
Pete's recommendation is very expensive.
Look at the HP 6263B: 0-20V/0-10A.
There's one on Canadian eBay for $149.95 or best offer at the moment.
I would consider that real cheap.
Don't know if I can post link on the forum but I'll PM it to you if you can't find it.
rgds,
/tri-comp
There's one on Canadian eBay for $149.95 or best offer at the moment.
I would consider that real cheap.
Don't know if I can post link on the forum but I'll PM it to you if you can't find it.
rgds,
/tri-comp
kepco bhk | eBay
Take a look at these Kepco supplies. There are 3 varieties: 2000 volts at 100ma, 1000 volts at 200ma, and 500 volts at 400ma. These guys on Ebay currently are asking too much for them, not that there aren't worth it. Seems like supply is greater than demand on these; wait till someone posts one that has a low starting price and no reserve. I got mine from Ebay for under $40; in fact shipping cost more than what the supply sold for. They are very good supplies, fully regulated; great for your B+ supply.
Lambda also makes good HV supplies:
Vintage Lambda C281M 1 350 Volt Regulated Tube PS Power Supply | eBay
Filament and bias supplies will be easier to find as the voltages are more common. It's going to be hard to find an already made power supply that has all three voltages integrated in one unit.
Daniel
Take a look at these Kepco supplies. There are 3 varieties: 2000 volts at 100ma, 1000 volts at 200ma, and 500 volts at 400ma. These guys on Ebay currently are asking too much for them, not that there aren't worth it. Seems like supply is greater than demand on these; wait till someone posts one that has a low starting price and no reserve. I got mine from Ebay for under $40; in fact shipping cost more than what the supply sold for. They are very good supplies, fully regulated; great for your B+ supply.
Lambda also makes good HV supplies:
Vintage Lambda C281M 1 350 Volt Regulated Tube PS Power Supply | eBay
Filament and bias supplies will be easier to find as the voltages are more common. It's going to be hard to find an already made power supply that has all three voltages integrated in one unit.
Daniel
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