Finally getting a H88/H89: looking for list of tantalum caps

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Bob Groh

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Dec 10, 2021, 11:36:06 AM12/10/21
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It has been a long time since I sold off the last of my H-89s and, due to the kindness of a SEBHC member, I have purchased a 'new to me' H-88 (upgraded to a H-89, I believe).  Huzzah!!! Not in my hands yet (pending a road trip up to Nebraska after the holidays) but laying in plans for future work on the new computer.

One of those plans is to go through it and replace ALL the tantalum caps with new electrolytics. To that end, it would be very handy if someone had a list of the tantalum caps on the H-89s CPU board and the terminal board (quantities, values and voltages). Would make ordering supplies soooooo much easier. 

I know I started a list like that back in the 2000's but can find no record of it.  And I can certainly dig up information (i.e. download manuals et al) and will be doing so anyways but thought I would try a posting first to see if anyone else has already done that and is willing to share. 

Thanks all and I am really looking forward to getting my 'new to me' H-88.  Even have a space for it down in the workshop.  Well, after I clear off some Heathkit HP-1144's power supplies of the bench!!

Bob Groh
Engineer, Heathkit Ham Radio Group, 1977 to 1981

Adrian Stoness

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Dec 10, 2021, 12:04:56 PM12/10/21
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Don't forget the line filter cap in the power jack on the back

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pbi...@gmail.com

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Dec 10, 2021, 1:19:59 PM12/10/21
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Bob:  This is the list that someone published last year (or so).  Can’t find the original :-<.

 

H19 - Pwr Sup

Diode - 1N4002 or 1N4005 600 PIV 1A Rectifier

D101

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N4002 or 1N4005 600 PIV 1A Rectifier

D102

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N4002 or 1N4005 600 PIV 1A Rectifier

D103

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N4002 or 1N4005 600 PIV 1A Rectifier

D104

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 3A1 or 1N5406 600 PIV 3A Rectifier

D105

1N5406-E3/73GICT-ND

H19 - Pwr Sup

Diode - 3A1 or 1N5406 600 PIV 3A Rectifier

D106

1N5406-E3/73GICT-ND

H19 - Pwr Sup

Diode - 3A1 or 1N5406 600 PIV 3A Rectifier

D107

1N5406-E3/73GICT-ND

H19 - Pwr Sup

Diode - 3A1 or 1N5406 600 PIV 3A Rectifier

D108

1N5406-E3/73GICT-ND

H19 - Pwr Sup

Diode - 1N2071 or 1N4005 600 PIV 1A Rectifier

D109

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N2071 or 1N4005 600 PIV 1A Rectifier

D110

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N2071 or 1N4005 600 PIV 1A Rectifier

D111

1N4005GP-E3/54GICT-ND

H19 - Pwr Sup

Diode - 1N2071 or 1N4005 600 PIV 1A Rectifier

D112

1N4005GP-E3/54GICT-ND

H19 - Video

Electrolytic Cap - 1.5uf ?V axial  not available

C231

axial

15mm

493-16910-ND

H19 - Pwr Sup

Electrolytic Cap - 10000uf 15V

C103

radial

25mm

493-1072-ND

H19 - Video

Electrolytic Cap - 10uf 80V

C202

axial

15mm

4087PHCT-ND

H19 - Video

Electrolytic Cap - 10uf 80V

C215

axial

15mm

4087PHCT-ND

H19 - Video

Electrolytic Cap - 10uf 80V

C241

axial

15mm

4087PHCT-ND

H19 - Chassis

Electrolytic Cap - 1500uf 100WV

C1

radial

36-40mm

338-1468-ND

H19 - Video

Electrolytic Cap - 22uf 100V

C226

radial

10mm

493-13257-1-ND

H19 - Video

Electrolytic Cap - 22uf 100V

C228

radial

10mm

493-13257-1-ND

H19 - Video

Electrolytic Cap - 22uf 35V

C239

radial

10mm

493-13257-1-ND

H19 - Video

Electrolytic Cap - 330uf 63V

C217

radial

17mm

493-11312-ND

H19 - Pwr Sup

Electrolytic Cap - 470uf 35V

C102

radial

16mm

493-12789-1-ND

H19 - Pwr Sup

Electrolytic Cap - 470uf 35V

C104

radial

16mm

493-12789-1-ND

H19 - Video

Electrolytic Cap - 47uf 200V

C242

radial

17mm

493-14734-ND

H19 - Video

Electrolytic Cap - 47uf 35V

C209

radial

10mm

493-11176-ND

H19 - Terminal

Regulator - 7805

U401

497-15682-5-ND

H19 - Terminal

Regulator - 7805

U402

497-15682-5-ND

H19 - Terminal

Regulator - 7905.2

U405

MC7905.2CTGOS-ND

H19 - Terminal

Regulator - 78M12

U403

497-13139-ND

H19 - Terminal

Regulator - 79M12

U404

497-12411-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C401

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C402

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C403

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C404

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C406

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C408

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C409

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C415

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 2.2uf 25V

C417

axial

7-15mm

(35v)

150D225X9035B2B-ND

H19 - Terminal

Tantalum Cap - 4.7uf 25V

C405

radial

 

 

 

478-7382-1-ND

H19 - Terminal

Tantalum Cap - 4.7uf 25V

C407

radial

 

 

 

478-7382-1-ND

H19 - Video

Tantalum Cap - 4.7uf 25V

C213

radial

 

 

 

478-7382-1-ND

H19 - Terminal

Tantalum Cap - 10uf

C418

radial

(35v)

478-4171-ND

H19 - Video

Tantalum Cap - 10uf

C204

radial

(35v)

478-4171-ND

H19 - Video

Tantalum Cap - 10uf

C205

radial

(35v)

478-4171-ND

H19 - Video

Tantalum Cap - 10uf

C227

radial

(35v)

478-4171-ND

H19 - Terminal

Tantalum Cap - 47uf

C414

radial

(6.3v)

478-4180-ND

H19 - Terminal

Tantalum Cap - 47uf

C421

radial

(6.3v)

478-4180-ND

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Adrian Stoness

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Dec 10, 2021, 1:24:55 PM12/10/21
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That the same for the 89 then? I should really get around to getting mine done

pbi...@gmail.com

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Dec 10, 2021, 1:34:11 PM12/10/21
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For those subsystems, yes.  The H89 processor board wasn’t mentioned at the time.  Then there are any daughterboards included in the configuration.  But this list will at least get those core subsystems covered, including electrolytics in the video if you are so inclined :->.

dwight

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Dec 10, 2021, 2:14:42 PM12/10/21
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I'm not a fan of blanket replacing capacitor. I know they pop every now and then but they rarely cause serious damage if caught before they burn the board or other components. I used to do new board test years ago and found new tantalum capacitors to be a high new failure as well. Not as high as these older ones but still not something like the robust carbon film resistors.
Tantalums in timiing circuits I might consider replace but for rail filters, I'd rather let them bow.
Old electrolytic are another thing. Unless carefully restored, they are a problem.
The other reason is, that although I consider my self to be an excellent PC board repairer, the chance of creating a problem of a broken trace is worth replacing a part that you don't even know is bad.
I have board with tantalum capacitors made in 1969 that haven't failed!
Dwight



From: se...@googlegroups.com <se...@googlegroups.com> on behalf of pbi...@gmail.com <pbi...@gmail.com>
Sent: Friday, December 10, 2021 10:34 AM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: RE: [sebhc] Finally getting a H88/H89: looking for list of tantalum caps
 

Gery Kissel

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Dec 14, 2021, 5:51:10 PM12/14/21
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Attached is my H8/17/19A + various boards refurb BOM.
I hope it helps!
Gery

H8 System Refurb SEBHC Rev2.xlsx

Bob Groh

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Dec 15, 2021, 11:03:26 AM12/15/21
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Gery, your spreadsheet is a great help and it is in a spreadsheet format!!  Win-win.  At least it covers the Terminal Board.  Dwight's comments about '..not replacing the tantalum's until they blow...' certainly has some relevance and I may very well adopt that stance. But only for the tantalum's!  The electrolytic's, particularly in the power supply, will be replaced pretty quickly. 

After some thought, I realized there is (as far as I know) no Heathkit BOM for the Terminal Logic PCB (but that is covered by Gery's H19 BOM ) or the Logic PCB and those will need to be extracted from the schematic. I'll use Gery's spreadsheet as a core - probably only include the tantalums.

I won't have the 'new' H-88 until late January so I have time to plan. The H-88 is said to be working so I will concentrate first on finding what I have in the way of software and manuals and then concentrate on adding some form of alternate memory/storage using some of the great work done by this group. 

Happy holiday's to all.

Bob Groh, Blue Springs, Missouri
Heathkit Engineer, Ham Radio Group, 1977 to 1981

Gery Kissel

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Dec 15, 2021, 4:45:41 PM12/15/21
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Bob,
I am not buying or selling... an exploding tantalum is what started my refurb in April 2020.  Everything worked great for 40 years prior to that.
At the time I just decided to replace what I could hoping everything will last another 40 years.  I did discover the 2 electrolytic caps on the H8 backplane were very puffy so I am happy with my approach.  (different supply voltage than the tantalum was on)
Some disclaimers:
I have a H19A.  I did get some feedback from the group that I had some of the cap values/IDs wrong.  Indeed they were correct for my H19A which seems to have had some revisions on the power supply and video boards.
You will also notice my spreadsheet includes some cap dimensions on it.  The new fangled electrolytic caps are a lot smaller in size than in the old days.  I replaced the electrolytic caps with higher voltage rating caps to more closely match the size of the caps they were replacing.

Best of luck.
Gery
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