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?? FWIW, 122 Megohms makes it a 410-B.? Probably makes no difference if a lower resistance is used.

Thanks Morris. Sorry in my haste late last night I ended up measuring R30 at 3.1k, I will check R40 but it appears ok to look at.

Thanks Jim yes I have the 229 prefix manual. Apologies I measured R30 late last night as 3.1k, I will check R40 now and the ripple when I get the 2 pots back in.

Another useful page in the manual is the one quoting resistance (cold) and voltage (hot) values at the tube sockets. The cathodes (pin 3) of the 6CW5's are merant to be 12K to chassis which would not

I am in need of a test fixture for my 1MHz HP 4271B LCR meter, a Hamfest find which I just fixed. Does anyone know if the Tonghui test fixtures work at this freq? TH26001A or TH26029 (with tweezer

Dear All, Finally I collected all things for my 4274a with high voltage measurement. The high voltage card working fine, but I can use it only on lower ranges in capacity mode. Video show what

Just a general general questions on replacing the paper caps. Does it matter if the replacement caps are placed with their foil side orientated in the same direction as the old caps? I know in audio

Hi Roy, Well you might be lucky and I assume you've looked to see whether the PCB is still available from Keysight? Probably not, as the 3245A is so old, but maybe. Otherwise, you might need to fix

Yes, those are all DC voltages. First, are you SURE that the manual you are using is correct for YOUR 200CD. Check the serial prefix on the serial number plate and compare it to what's listed on the

The 6268B (and similar models) holds up well in adverse conditions, and many pallets full of them have been sent to our military in Irag and Afghanistan for those "wars". I still see requests for them

Bonjour à tous We manufactured transformers since 1970s, and did not suffer magnetosstriction noise, as the lamination was secured tightly and usually vacuum varnish impregnated. I have fixed loud

It would be worth looking at the 6674A too. The standard model is 60 V, 35 A, but there are options for 70 V 30 A (quite rare), as well as options for voyages lower than 60 V, but currents higher

-- Members I am a new member, and I have a *HP 3245A Universal Source* ,? I purchased this some years ago, and for a while it worked well. Eventually the IEC power input Socket/Filter broke down,

I’m sorry I can’t assist but my 200CDs and all my documents are home and I’m not. Jeremy [email protected]> wrote:

Thanks for the confirmation of the humming described by some sellers being normal. Sounded strange that HP would use regular transformers that would start to hum over time. Now its clear its more like

I will need to test 12V and 24V equipment up to 20Amps, so the 40V 30Amp model seemed to fit the bill. And HP being HP, why not. Do you have another suggestion? Thanks.

120Hz…, sounds like that is PSU (double mains freq, assuming 60Hz) rather than actual output… Sent: 26 October 2021 11:49 To: [email protected] Subject: Re:

Thanks Morris. The 200CD is only producing a rather odd shaped wave of perhaps 200mv and random frequency somewhere < 120hz. It responds slightly to the amplitude dial but not to the frequency dial.

Yes, the voltages on the schematic are DC using a voltmeter with a high input resistance quoted on the schematic as 122 megohms. The voltage using a modern DMM with an input resistance of 10 megohms

Sorry for the multiple posts. Does anyone know what voltages should be seen for the secondaries of transformers T1 & T2 ? Regards Richard