1976 HP-25C USA - Works, serviced and restored

Retroplexus Calculator Repair & Restoration

Why my calculators are different

I acquire these calculators mostly in non-working condition and meticulously repair and restore them using my 50 years of electronics experience. Unlike most sellers, I fully document every fault found and every repair performed, so you know exactly what you are getting and can buy with confidence.

A note about pricing

I buy calculators at good prices, restore them, and resell them with a modest margin that covers costs and fees. The profit is not large relative to the time involved in repairs.

My focus is the craft of restoration and preservation of these calculators for enjoyment and as working tools.

Shipping: Make sure to check the different shipping options for the best shipping price. Use the "see details" link in the shipping section of the listing.

Item Details

Brand HP (Hewlett Packard)
Model HP-25C
Year 1976
Display Type LED
Generation/construction Woodstock
Condition Calculator works 100%. Case has some discolouration. Pouch, batteries are in good condition. Manuals are in used good condition with some writing in front cover. See pictures.

What Is Included

  • HP-25C Calculator
  • Original Woodstock battery with modern AA cells installed (cells are replaceable)
  • Original HP-25C Owner's Handbook
  • Original HP-25C Application Book

Only the items shown in the photos are included with this listing.

Condition Details

  • Display: bright and clear, all segments working
  • Keyboard: no issues, slight discolouration, a few key bed labels at the top are slightly worn
  • Case: some discolouration, some wear on Memory logo at end of word
  • Power: uses original battery system, can use regular AA cells
  • Battery compartment: clean
  • Internal: no internal issues
  • Pouch: excellent condition
  • Manuals: good used condition, wear marks, name stamped in front cover

Please review photos carefully as they form part of the item description.

Service & Restoration Details

Service work is performed conservatively to improve reliability while preserving original circuitry and components.

  • Minor battery corrosion damage for these models
  • All corrosion removed and mitigated from recurrence
  • Keyboard switches cleaned
  • Keyboard , circuit boards and context cleaned and protected with DeoxIT

Outstanding Issues

  • None

Please review photos carefully as they form part of the item description.

Collector Information

Calculator serial number: 1611A20376 (early 1976 USA)

Shipping

  • Carefully packaged to protect this vintage device
  • Ships within 5 business day after payment
  • Tracking included where available
  • Calculator case, key bed and pouch cleaned

Returns

  • Due to the vintage nature of the item no returns are accepted

Related Vintage Calculator Models

Collectors researching vintage Hewlett-Packard scientific and programmable calculators often search for models such as: HP-35, HP-45, HP-55, HP-80, HP-55, HP-65, HP-67, HP-91, HP-92, HP-97, HP-70, HP-21, HP-22, HP-25, HP-25C, HP-29C, HP-19C, HP-10, HP-31E, HP-32E, HP-33E, HP-33C, HP-34C, HP-41C, HP-41CV, HP-41CX, HP-10C, HP-11C, HP-12C, HP-15C, HP-16C, HP-48S, HP-48SX, HP-48G, HP-48GX

Vintage calculators from this era commonly used LED or early LCD display technology and remain popular with collectors of early electronic computing and calculating devices.

Search reference: HP48SX HP-48SX, Hewlett Packard HP48SX calculator.

All trademarks and brand names are property of their respective owners and are used only to describe the item being sold.