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  1. Replies
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    @NoelW - I have to ask... what is the reason for...

    @NoelW - I have to ask... what is the reason for the thumbs down on my post above??
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    Proper LEN > TxF Primary Wiring

    Hello, Happy New Year!

    Looking at schematics from different manufacturers I find conflicting, or at least different, ways of wiring up between power socket and transformer.

    The way I have...
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    Interesting - good point!!

    Interesting - good point!!
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    Oh yea, I almost forgot about the first one. I...

    Oh yea, I almost forgot about the first one. I usually implement that actually. Though for one reason or anther (I forget much of what I read in Merlin's books, so I am constantly skimming over again...
  5. Thread: Humdingers RULE!!

    by Gtr0
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    379

    Sorry, I didn't receive the usual notification on...

    Sorry, I didn't receive the usual notification on this post... Well, it was hum with buzzy noise on top, I'd do better to remember to separate those in description in the future. So the hum went away...
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    Standby switch on just screen supply... ?

    Hello.
    As is usual at this juncture of building a new amp I am pondering on the standby switch. I do not know enough of the science and theory on it, but it seems to me that amps in general would be...
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    I was having A LOT of EL34 woes a year or more...

    I was having A LOT of EL34 woes a year or more ago... until I switched to Watford Valve tubes... their 'Harma' brand retros specifically - which I think are Tung Sol EL34xxxx (B-STR? or something...
  8. Thread: Humdingers RULE!!

    by Gtr0
    Replies
    16
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    379

    Humdingers RULE!!

    Hi Gang.

    I needed to drop a note on my latest experience with high'ish gain amp noise.

    Having built several high gain (and medium-high gain) amps over the last number of weeks, I have become...
  9. you mean as opposed to starving a late 60's...

    you mean as opposed to starving a late 60's superlead of nutritional voltage?

    Thanks... got what i needed!!
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    Safe to assume that the signal level wasn't...

    Safe to assume that the signal level wasn't strong enough to clip at 18v?
  11. Still have this on the back burner.... but still...

    Still have this on the back burner.... but still want to do it, so I have been looking around in spare time for the correct relays that are available.

    How about these ones??
    Finder F36119-009A
    ...
  12. another tool posting, this time it is a Tufvassons Autotransformer (variac)

    Hi :-)

    For this weeks question on shop tools, I would like to buy a Tufvassons "rotary transformer" for bringing up voltage slowly to a connected amplifier. I have some questions about the...
  13. What are we talking here? $100 or $1,000?

    What are we talking here? $100 or $1,000?
  14. So the plan is to stick with one of these...

    So the plan is to stick with one of these reputable brands... I have a 10:1 tektronix that came with my 475, I will have to look up the model number etc, but it's safe to say that I will probably...
  15. okay - I took the plunge on the Tek TDS1002....

    okay - I took the plunge on the Tek TDS1002. Fingers crossed it all works out. 250€

    So I looked up the specs first, 300 v max input... with a 10:1 probe it's good for 3000 volts right? more or...
  16. yikes - on second thought that one seems to be...

    yikes - on second thought that one seems to be coming straight from China even though it says UK... 35 day delivery time... pffffffff :thumbsdown:
  17. Thank you all for the input!! I too would like...

    Thank you all for the input!!

    I too would like a smaller digital version... I had my finger on the trigger for that Tek TDS1002 a few times.... just wanted an opinion there!!! And then after...
  18. Can you please help me narrow down between these used oscopes?

    Hi Folks.

    Not sure where to post this, but here goes.

    Well, after staring at my non-tracing Tektronix 475 for a few months, opening it up several times trying to find something burned or...
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    That's where I get them made now, as I said there...

    That's where I get them made now, as I said there are limitations though... 600mm wide and 70mm high.

    Okay, well, I get the impression that it's just not gonna happen. Thanks anyway!
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    Well, I sort of threw in Dagnall to enhance my...

    Well, I sort of threw in Dagnall to enhance my frustration.... Actually I have several IMO and a few Dagnall's - both power and output - IMO makes great transformers. In one case I wanted to make a...
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    I did that, as i said that in the original...

    I did that, as i said that in the original post... it has been at least two weeks now. no reply.
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    custom chassis in europe?

    Hi Gang.
    It's surprising to me how difficult it is to find a place that will make a chassis based on a cad drawing. I live in Belgium and have sent several emails to Belgian metal shops and not a...
  23. I was waiting to reply as I was absorbing the...

    I was waiting to reply as I was absorbing the document... and I did raise a question flag at that same formula. But all good to know! Thanks
  24. Yes, usually I find them max out at 6k8, 8k2 or...

    Yes, usually I find them max out at 6k8, 8k2 or 10k... once in a while I can find higher values... just picked up some Audio Gold (Ohmite wirewound) 15k, 18, and 22k.... but they are large tubular......
  25. Good note! Thanks. Right - I ALWAYS forget...

    Good note! Thanks.


    Right - I ALWAYS forget that.


    Nice, thanks for the info!

    Thanks everyone... I find it to be both a learning experience and fun sorting this out and learning about it...
  26. Right, per capacitor - I have read that actual...

    Right, per capacitor - I have read that actual page a handful of times and when it comes time to calculate those resistances I re-read that section to make sure I am calculating the correct sum.
    ...
  27. Ooooh yeea. Sometimes I feel so... unimaginative....

    Ooooh yeea. Sometimes I feel so... unimaginative.

    I know such is the case for plate resistors, and yet never applied it to the node resistors that come directly before it. Thanks, sometimes I just...
  28. This time I have questions about sharing resistors for stacked filter caps

    Hello again. Full of questions this morning that I have been trying to figure out for some time.

    Equalizing resistors to share voltage evenly between stacked, rather in-series, filter capacitors....
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